Virginia Institute Research Articles

The Degradation of Work in the Twentieth Century

This article is a slightly edited version of a talk given by Harry Braverman in Spring 1975 at the West Virginia Institute of Technology. As far as we know this was his last recorded presentation. - The EditorsThis article can also be found at the Monthly Review website, where most recent articles are published in full.Click here to purchase a PDF version of this article at the Monthly Review website.

AN ENTREPRENEURIAL THEORY OF GAMES(*)

MetroeconomicaVolume 31, Issue 2 p. 145-166 AN ENTREPRENEURIAL THEORY OF GAMES(*) S. C. Littlechild, S. C. Littlechild University of Birmingham and New York University.Search for more papers by this author S. C. Littlechild, S. C. Littlechild University of Birmingham and New York University.Search for more papers by this author First published: June 1979 https://doi.org/10.1111/j.1467-999X.1979.tb00241.xCitations: 7 * This is a revised version of a paper presented at the International Symposium on Extremal Methods and Systems Analysis in honour of A. Charnes, University of Texas at Austin, September 1977. That paper was in turn based on Chapter VI of a Report written in September 1975 during the author's visit to the Department of Economics, UCLA, on a Research Fellowship financed by AT & T. Some of the ideas were presented at seminars at Virginia Polytechnic and Institute, Rice University and the University of Paris, where the author benefitted from the suggestions and encouragement of Professors J. M. Buchanan, W. F. Lucas and M. Shubik. Helpful comments have also been received from A. Charnes, W. W. Cooper and L. S. Shapley. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume31, Issue2June 1979Pages 145-166 RelatedInformation

Britain and the American Frontier, 1783-1815

Journal Article Britain and the American Frontier, 1783–1815 Get access Britain and the American Frontier, 1783–1815. By Wright J. LeitchJr. (Athens: University of Georgia Press, 1975. xii, 251 p. Illustrations, maps, bibliography, index. $9.50.) Otis K. Rice Otis K. Rice West Virginia Institute of Technology Search for other works by this author on: Oxford Academic Google Scholar Western Historical Quarterly, Volume 9, Issue 4, October 1978, Pages 524–525, https://doi.org/10.2307/967463 Published: 01 October 1978

Kentucky: A Bicentennial History

Journal Article Kentucky: A Bicentennial History Get access Kentucky: A Bicentennial History. By Channing Steven A.. (New York: W. W. Norton & Company, Inc., and Nashville: American Association for State and Local History, 1977. xv, 222 p. Illustrations, maps, suggestions for further reading, index. $8.95.) Otis K. Rice Otis K. Rice West Virginia Institute of Technology Search for other works by this author on: Oxford Academic Google Scholar Western Historical Quarterly, Volume 9, Issue 3, July 1978, Pages 349–350, https://doi.org/10.2307/966928 Published: 01 July 1978

Computers and Society Bibliography. (Copies are available from Gerald L. Engel, Department of Computing and Statistics, Virginia Institute of Marine Science, Gloucester Point, Virginia 23062, at $2.30 per copy in the U.S., $3.30 mailed abroad

Computers and Society Bibliography. (Copies are available from Gerald L. Engel, Department of Computing and Statistics, Virginia Institute of Marine Science, Gloucester Point, Virginia 23062, at $2.30 per copy in the U.S., $3.30 mailed abroad

Credit by CLEP: A Disconcerting Look at a Good Idea

Abstract Virginia Western Community College (VWCC) reviewed its policy of awarding academic credit to students for successful completion of the General College Level Examination Program (CLEP), which many institutions use to determine whether students should be awarded credit for knowledge and skills acquired through off-campus programs, life experiences, or self-study. The review revealed several areas of concern about the use of CLEP at VWCC. The findings from this study should be of interest to all institutions that either now award CLEP credit or are considering the adoption of a CLEP credit policy: (1) Faculty review committees questioned the content validity of several of the examinations. (2) Administration of the examinations to VWCC students who successfully completed CLEP courses produced low correlations between CLEP scores and course grades. (3) CLEP policies vary considerably among Virginia's institutions of higher education and this creates serious transfer problems. (4) There are advantages...

Fine Structure of Marteilia sydneyi sp. n.: Haplosporidan Pathogen of Australian Oysters

A new species of oyster pathogen, Marteilia sydneyi, from Australian oysters, Crassostrea commercialis, is described incorporating light and electron microscope observations. The pathogen is a haplosporidan which exists as a plasmodium in the oyster hepatopancreas. Upon sporulation, 8 to 16 uninucleate sporangial primordia are internally cleaved (endogenously budded) from each plasmodium; thus conversion to a sporangiosorus occurs. Each sporangium enlarges and internally cleaves into 2 or 3 spore primordia each of which, in turn, internally cleaves into 3 uninucleate sporoplasms of graded sizes, the largest containing the smaller 2 in a vacuole and the intermediate-sized one containing the smallest in a vacuole. The spore wall is continuous without an orifice or operculum. Wolf (1972) recorded the presence of a haplosporidan in Sydney Rock oysters (Crassostrea commercialis Iredale and Roughley) from Moreton Bay, Queensland, Australia, in which he noted spores in the hepatopancreas. In subsequent papers Grizel et al. (1974) and Mix and Sprague (1974) noted its close similarity to Marteilia refringens Grizel, Comps, Bonami, Cousserans, Duthoit, and LePennec, a pathogen of Ostrea edulis Linne in French estuaries. Grizel et al. (1974) suggested that M. refringens is one of the lower fungi; however, Perkins (1976) noted haplosporidan characteristics in the form of haplosporosomes and in the mechanism of spore formation from sporangia. The organism has, therefore, been placed in the Class Haplosporea. The present paper shows that the pathogen of C. commercialis is a haplosporidan and is in the same genus as the pathogen of Ostrea edulis, popularly known as the agent of Aber disease (Alderman, 1974). The pathogen has been found only in subtropical and tropical regions of the eastern Received for publication 14 October 1975. *Contribution No. 744, Virginia Institute of Marine Science, Gloucester Point, Virginia 23062. Australian coast, not in the colder waters south of Richmond River in Australia. The other species of Crassostrea, C. echinata Quoy and Gaimard, from the eastern coast of Australia is also parasitized by a species of Marteilia probably identical to the one described herein (Wolf, unpublished). MATERIALS AND METHODS Blocks of hepatopancreas, 1 to 4 mm8 in size, were obtained from Moreton Bay, Queensland oysters (C. commercialis) and fixed in 6% glutaraldehyde for 5 to 7 days during transit from Australia to the U.S.A. Subsequent treatment has been described (Perkins, 1976). Light micrographs were obtained from histological slides of oysters fixed in Davidson's fluid and stained with Harris' hematoxylin and eosin. Conclusions concerning spore structure were based on electron microscope observations of serial sections through 2 spores as well as observations of individual sections. Serial sections were mounted on a Formvar substrate on Mason and Morton slot (2 X 1 mm) discs.

Occurrence of hematopoietic neoplasms in Virginia oysters (Crassostrea virginica).

A neoplastic disease of the hematopoietic system of oysters was found in tray-cultured native and laboratory-bred populations and was associated with mortalities during field monitoring. The disease, characterized by nuclear abnormalities and intensive proliferation of hemocytes, was first observed at the Virginia Institute of Marine Science in 1963. Cases rarely occurred during 14 years (1959-1973 inclusive) of regular sampling and monitoring of thousands of oysters. However, two groups exhibited a high susceptibility to this disease in a program of intensive inbreeding to achieve genetic resistance to oyster pathogens.

Report on acm's activity on community and junior college curriculum career program in computer programming

A Workshop in Two Year College Programs in Computer Science was held August 11-13, 1975 in Gloucester Point, Virginia. Sponsored by the ACM's Special Interest Group in Computer Science Education (SIGCSE), it brought thirteen community and junior college participants together at the Virginia Institute for Marine Science (VIMS) to work toward recommendations for a two year program. Representing ACM were Dr. Richard Austing, Chairman, SIGCSE, Associate Professor in the Computer Science Department of the University of Maryland, and Dr. Gerald L. Engel, Executive Secretary of the ACM Curriculum Committee on Computer Science (C S), Director of Computing and Statistical Services at VIMS, Dr. Bruce Barnes of the National Science Foundation also attended. Joyce C. Little, Chairman of the ACM's Two Year College Subcommittee of C S and Professor and Chairman of the Data Processing and Computing Sciences Department at the Community College of Baltimore, served as Chairman of the Workshop. This panel presentation, given by participants in the workshop, is the first public discussion of the material under development by this group, being chaired by Joyce Currie Little, Chairman of the Ad Hoc Subcommittee for 3 Community and Junior College Curriculum, serving under the Curriculum Committee in Computer Science (C S). Reaction to, and discussion of, the preliminary findings of this group, will been couraged from the audience.

Report on acm's activity on community and junior college curriculum career program in computer programming

A Workshop in Two Year College Programs in Computer Science was held August 11-13, 1975 in Gloucester Point, Virginia. Sponsored by the ACM's Special Interest Group in Computer Science Education (SIGCSE), it brought thirteen community and junior college participants together at the Virginia Institute for Marine Science (VIMS) to work toward recommendations for a two year program. Representing ACM were Dr. Richard Austing, Chairman, SIGCSE, Associate Professor in the Computer Science Department of the University of Maryland, and Dr. Gerald L. Engel, Executive Secretary of the ACM Curriculum Committee on Computer Science (C S), Director of Computing and Statistical Services at VIMS, Dr. Bruce Barnes of the National Science Foundation also attended. Joyce C. Little, Chairman of the ACM's Two Year College Subcommittee of C S and Professor and Chairman of the Data Processing and Computing Sciences Department at the Community College of Baltimore, served as Chairman of the Workshop. This panel presentation, given by participants in the workshop, is the first public discussion of the material under development by this group, being chaired by Joyce Currie Little, Chairman of the Ad Hoc Subcommittee for 3 Community and Junior College Curriculum, serving under the Curriculum Committee in Computer Science (C S). Reaction to, and discussion of, the preliminary findings of this group, will been couraged from the audience.

A Revision of Some Trypanorhynchs from the Western North Atlantic Described by Edwin Linton

The species of trypanorhynchs described by Edwin Linton (18910) as Rhynchobothrium tumidulum and Rhynchobothrium hispidum are assigned to the genus Prochristianella Dollfus 1946. Prochristianella penaei Kruse 1959 is a synonym of R. hispidum. Rhynchobothrium brevispine Linton 1897 is placed in the genus Mecistobothrium Heinz and Dailey 1974. The species Prochristianella hispida (Linton 1890) comb. n., P. tumidula (Linton 1890) comb. n., and Mecistobothrium brevispine (Linton 1897) comb. n. are redescribed. Adults of Parachristianella monomegacantha Kruse 1959 from Dasyatis americana Hildebrand and Schroeder, taken in Chesapeake Bay, Virginia, are described. Edwin Linton, in a series of works spanning about half a century, described many cestodes from fishes in the western North Atlantic. Among his descriptions are numerous trypanorhynchs, many of which he believed to be speies of Rhynchobothrium Rudolphi 1819. Dollfus (1929) examined this genus and found it to consist of a complex of genera, thereby rejecting it. He subsequently made several contributions (1942, 1946) correcting the taxonomy of some of Linton's species but the status of many more remains uncertain and requires clarification. Nine of Linton's species were reclassified by Dollfus and the clarification of four more species of Rhynchobothrium in this paper brings to 13 the number correctly identified to date. A list of those species (Table I), their new combinations, and authors, is appended. In the present paper Prochristianella hispida (Linton 1890) comb. n., Prochristianella tumidula (Linton 1890) comb. n., and Mecistobothrium brevispine (Linton 1897) comb. n., are redescribed. Rhynchobothrium agile Linton 1897 is a synonym of M. brevispine (Linton 1897) comb. n. MATERIALS AND METHODS Elasmobranchs were collected from Atlantic coastal waters during the years 1967 to 1972 from Chesapeake Bay, Virginia, and southern New England. Through the cooperation of the Virginia Institute of Marine Science, local fishermen, or research vessel CORSAIR, hosts were collected in trawling nets, traps, or with hook and line. Helminths were fixed in situ or removed from the spiral valve, studied alive, and fixed without pressure in AFA at room temperature. Whole mounts were stained with Ehrlich's acid hematoxylin or Mayer's paracarmine, dehydrated, and mounted according to standard procedures. Some scoleces were cleared in Langeron's lactophenol and mounted in glycerin jelly to facilitate study of the tentacles. Type specimens were obtained from the USNM Helminth Collection for comparison. Drawings were made with the aid of a microprojector and photomicrography. Measurements are in micrometers unless otherwise indicated and are expressed as length by width. Prochristianella hispida (Linton 1890) comb. n.

The Growth of Political Institutions in Virginia, 1634 to 1676

ECENT investigations into the texture of colonial America's political culture and the resurgence of scholarly interest in local records suggest the need for a fresh approach to the study of the growth of political institutions in seventeenth-century Virginia.' To provide a framework for reexamining those institutions between i634 and i676 is the purpose of this essay. Central to this objective is the thesis that the General Assembly's creation of the county court system of local government in i634 set in train changes which profoundly affected the character of Virginia's political institutions. Creation of the county courts divided the functions and powers of government between the newly erected local jurisdictions and those governmental organs already in existence at Jamestown. Over a thirty-year period after i634 that division was greatly enlarged by statutory additions to the county courts' responsibilities, by customs, and by local conditions. As the courts' competence in local matters expanded, the General Assembly began to assume a more purely legislative function; the Assembly's development, however, did not keep abreast of the county courts. Furthermore, the governor's broad powers to direct the colony's political life were eroded by custom and the willing acquiescence of governors. As the county courts became important centers of power, some Vir-

Books

Abstract Sport and Identity. Patsy Neal. Philadelphia, Pa. 19130: Dorrance and Company, 1809 Callowhill St. 1972. 195 pp. $5.95. Reviewed by Robert N. Singer professor, Department of Physical Education, Health, and Recreation, Florida State University, Tallahassee, Florida. Problem Solving in Recreation and Parks. Joseph J. Bannon. Englewood Cliffs, New Jersey 07632: Prentice-Hall, Inc. 1972. 347 pp. $9.95 cloth, $5.95 paper. Reviewed by Donald A. Pelegrino coordinator of graduate studies in recreation, California State University, Northridge, California. Scientific Basis of Athletic Conditioning. C. R. Jensen and A. G. Fisher, Philadelphia, Pa. 19106: Lea and Febiger, 600 S. Washington Sq. 1972. 257 pp. $10.00. Reviewed by Benjamin H. Massey director, Physical Fitness Research Lab, University of Illinois, Urbana, Illinois 61801. Chronicle of American Physical Education 1855–1930. Aileene S. Lockhart and Betty Spears, editors. Dubuque, Iowa 52001: Wm. C. Brown Co., 135 S. Locust St. 1972. 462 pp. $5.95. Reviewed by J. Edmund Welch professor of physical education, West Virginia Institute of Technology, Montgomery, West Virginia.

Preparation of some arylpyrimidines

Journal of Heterocyclic ChemistryVolume 9, Issue 4 p. 931-932 Note Preparation of some arylpyrimidines† J. S. Gillespie Jr., Corresponding Author J. S. Gillespie Jr. Virginia Institute for Scientific Research, Richmond, Virginia 23229Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this authorSatya Prakash Acharya, Satya Prakash Acharya Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this authorR. E. Davis, R. E. Davis Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this author J. S. Gillespie Jr., Corresponding Author J. S. Gillespie Jr. Virginia Institute for Scientific Research, Richmond, Virginia 23229Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this authorSatya Prakash Acharya, Satya Prakash Acharya Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this authorR. E. Davis, R. E. Davis Virginia Institute for Scientific Research, Richmond, Virginia 23229Search for more papers by this author First published: August 1972 https://doi.org/10.1002/jhet.5570090431Citations: 4 † The work described in this paper was performed under contract DA-49–193-MD-2981 with the U. S. Army Medical Research and Development Command. This is Contribution No. 1053 from the Army Research Program on Malaria. AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article.Citing Literature Volume9, Issue4August 1972Pages 931-932 RelatedInformation

Water velocity meter

A novel water velocity meter has been designed by personnel at NASA's Langley Research Center for the Virginia Institute of Marine Science. The device is used to measure current flows in near‐shore waters. The technology is available for private use or commercial manufacture on a royalty‐free, nonexclusive basis from NASA.The water velocity meter uses strain gauge force balance measurement techniques. A novel drag‐sphere increases the effect of water flow, and strain gauges measure the deflection of a thin metal rod. The innovation represents an improvement over conventional propeller driven velocity meters. The NASA meter is a relatively simple, reliable, inexpensive instrument that provides for the measurement of speed and direction of current flow. It is compatible with automatic data acquisition and reduction equipment.

Salinity Tolerance of Young Blueback Herring, Alosa aestivalis

Transactions of the American Fisheries SocietyVolume 101, Issue 1 p. 123-125 Short Papers and Notes Salinity Tolerance of Young Blueback Herring, Alosa aestivalis Mark E. Chittenden Jr., Mark E. Chittenden Jr. Virginia Institute of Marine Science, Gloucester Point, Virginia, 23062 USASearch for more papers by this author Mark E. Chittenden Jr., Mark E. Chittenden Jr. Virginia Institute of Marine Science, Gloucester Point, Virginia, 23062 USASearch for more papers by this author First published: January 1972 https://doi.org/10.1577/1548-8659(1972)101<123:STOYBH>2.0.CO;2Citations: 5AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL No abstract is available for this article.Citing Literature Volume101, Issue1January 1972Pages 123-125 RelatedInformation

Sea Grant awarded to Virginia Institute of Marine Science

NOAA has awarded a $249,600 Sea Grant to the Virginia Institute of Marine Science (VIMS), Gloucester Point, Virginia. The grant will support the third year's activities in improved management and use of estuarine and coastal resources on Chesapeake Bay.Emphasizing research to improve crustacean and mollusk fisheries, the VIMS scientists are working on the general biology of the blue crab, are assessing rock crab for commercial potential, and are studying the distribution and habitat preferences of larval blue crabs. They are also working to determine the optimum conditions for holding blue crabs for commercial shedding by the soft crab industry. The VIMS group will increase its efforts to stimulate industry use of clam protection methods already developed in the program. VIMS plans to supply seed clams for commercial plantings while encouraging industry to develop commercial sources.

Notes on Tetraphyllidean Cestodes from the Atlantic Coast of North America, with Descriptions of Two New Species

The genus Rhinebothrium Linton, 1890 (Tetraphyllidea: Phyllobothriidae) is redefined and considered valid. Rhinebothrium spinicephalum sp. n. and R. lintoni sp. n. are described from the southern stingray, Dasyatis americana Hildebrand and Schroeder. The phyllobothriid, R. maccallumi Linton, 1924, and the oncobothriid, Acanthobothrium tortum (Linton, 1916), are redescribed. Discovery of a hermaphroditic specimen of Dioecotaenia cancellata (Linton, 1890) indicates that the dioecious character of these cestodes is not absolute. Until recently, little has been done to clarify or contribute to the knowledge of the elasmobranch cestode fauna from the western North Atlantic since the work of Linton. Linton's descriptions of helminths of teleost and elasmobranch fishes frequently are too inadequate for accurate identification. Furthermore few of Linton's type specimens are available and, of those that are, many have faded and partially disintegrated. Linton (1890) described the genus Rhinebothrium to accommodate species resembling Echeneibothrium, a genus common to the eastern North Atlantic and Mediterranean Sea, but lacking a myzorhynchus (rostellum). He included four species in this genus. Among Linton's descriptions only two dealt with species of Echeneibothrium. One (E. austrinum Linton, 1924) is considered inadequately described, and the second (E. vernetae; syn. E. variabile Beneden sensu Linton, 1889) was redescribed as a new species by Euzet (1956a). The validity of the genus Rhinebothrium has been questioned by Wardle and McLeod, 1952; Young, 1956; Yamaguti, 1959; and Alexander, 1963; and is considered as synonymous with Echeneibothrium. However, Baer (1961) and Williams (1966) have provided evidence that Rhinebothrium may be distinct from Echeneibothrium. Recent collections of elasmobranch cestodes from the Atlantic Coast and Chesapeake Bay have disclosed two new species of Rhinebothrium and sufficient material to better define the morphology of R. maccallumi Linton, 1924. Cestodes designated as Rhinebothrium cancelReceived for publication 18 September 1969. latum by Linton (1890) were recovered from two cow-nosed rays, Rhinoptera bonasus (Mitchill). Schmidt (1969) examined specimens of this cestode from a single cow-nosed ray and found their morphology unlike that of any other family in the order Tetraphyllidea. Due to the unusual characters of these cestodes, among which Schmidt cites their separate sexes, he designated Dioecotaenia cancellata (Linton, 1890) gen. et comb. n. and proposed the new family Dioecotaeniidae. My recovery of a hermaphroditic specimen of Dioecotaenia indicates that the dioecious character of these cestodes is not absolute. This paper also describes in detail Acanthobothrium tortum (Linton, 1916), an oncobothriid recognized as a member of Acanthobothrium by Southwell (1925) and briefly redescribed by Baer and Euzet (1962). MATERIALS AND METHODS Elasmobranchs were collected during the summers of 1967 and 1968 in Atlantic coastal waters from New Jersey to Chesapeake Bay, Virginia. Through the cooperation of the Virginia Institute of Marine Science, hosts were collected in trawling nets, or with hook and line. Specimens of Acanthobothrium tortum, donated by Dr. R. J. Goldstein, Emory University, were collected at the Cape Haze Marine Laboratory, Sarasota, Florida. Helminths were fixed in situ or removed from the spiral valve, studied alive, and fixed without pressure in alcohol-formol-acetic acid (AFA) at room temperature. Whole mounts were stained with Ehrlich's acid hematoxylin or Mayer's paracarmine, cleared in methyl salicylate, and mounted in Permount. Frontal and transverse serial sections were stained in Heidenhain's iron hematoxylin and eosin. Drawings were made with the aid of a camera lucida and microprojector. All species were compared with available specimens from the USNM Helminthological Collection. Measurements

Biological relationship of Callinectes sapidus (Rathbun) with carcinonemerteans, bryozoan, and barnacles.

SummaryA number of organisms occurring on blue crabs do not seem to affect their normal growth and survival.The authors wish to acknowledge their indebtedness to Professor W. Van Engel from the College of William and Mary and the Virginia Institute of Marine Science, Gloucester Point, Virginia where this work was started. The authors also wish to express their gratitude to Dr. Ross Nigrelli, Director of the New York Aquarium for his valuable counsel during the performance of this work.

New Species of Acanthobothrium (Cestoda: Tetraphyllidea) from Chesapeake Bay, Virginia

Two new species of Acanthobothrium, A. americanum, and A. lineatum, are described from a new host, Dasyatis americana Hildebrand and Schroeder. Acanthobothrium paulum Linton, 1890, is redescribed and considered a valid species. Additional data and corrections are presented in a redescription of A. brevissime Linton, 1908. The locality record for A. floridensis Goldstein, 1964, is extended to Chesapeake Bay, Virginia. A revised key to the species of Acanthobothrium from the Atlantic Coast of North America is presented. Seven species of Acanthobothrium have been described as endemic to elasmobranch fishes from the western north Atlantic and Gulf of Mexico. To date, six of these species, two of which were redescribed by Goldstein (1964), have been considered taxonomically distinct. A study of elasmobranch parasites from the Chesapeake Bay and Atlantic Coast (data to be presented elsewhere) has provided two new species of Acanthobothrium and sufficient material to better define the morphology of A. brevissime Linton, 1908, and to validate A. paulum Linton, 1890. Additional data on the morphology of A. floridensis Goldstein, 1964, were also obtained. MATERIALS AND METHODS Elasmobranchs referred to in this paper were collected from the southern region of Chesapeake Bay, at the Virginia Institute of Marine Science, during the months of June to August, 1967 and 1968. Hosts were collected in trawling nets, or with hook and line. Collecting sites were limited to the lower bay area in that region extending from the mouth of the York River across Hampton Roads to Cape Charles on the Eastern Shore peninsula (37? N, 76020 W). Tetraphyllideans were fixed in situ or removed from the spiral valve, washed in seawater, studied alive, and fixed without pressure in aceto-formol-alcohol either heated or at room temperature. Whole mounts were stained with Ehrlich's acid hematoxylin, cleared in methyl salicylate, and mounted in Permount. Serial sections, stained in Heidenhain's iron hematoxylin and eosin, were studied in frontal, transverse, and sagittal views. Drawings were made with the aid of a camera lucida and microprojector. Descriptive measurements are presented in the manner suggested by Goldstein (1967). All species were compared with available specimens from the USNM Helminth Collection, from the collection of Dr. Robert J. Goldstein, Emory University, and from elasmobranchs collected in the Bay of Naples, Italy. Received for publication 10 December 1968. All measurements are in microns unless otherwise indicated.