Island, during a visit to the Lerner Marine Laboratory of the American Mu.seum of Natural History, Bimini, Bahamas. Both species of lamellibranch were found in clean coral sand at a depth of approximately four feet of water. The parasite was not recorded by C. B. Wilson (1935) or Pearse (1951) in their works dealing with the parasitic crustacea from this region. The presence of a slender 6-segmented first antenna, the second segment of which is elongate, and a markedly prehensile second antenna, together with the characteristic form of the maxillae and the first four pairs of legs, would appear to place the parasite as a member of the family LICHOMOLGIDAE (Suborder CYCLOPOIDA). But, descriptions of related species by Yamaguti (1936), Pearse (1947) and M. S. Wilson (1950) make it necessary to reconsider whether a new family should be created. The absence of maxillipeds in the female and the presence of a stout pair in the male, together with the characteristic triangular spines on the outer margins of both rami of the first pair of legs and the structure of the fifth pair of legs would appear to place it in the genus Myicola (see p. 62) first described by Wright (1885) and later by Wilson (1932). Myocheres inflata, new species Female. The animal is greyish white in color, the overall length (to the tip of the caudal setae) of the specimens collected varied from 1.8-3.7 mm. The head is heart-shaped and is fused with the first segment. Segments two, three and fou.r are as wide as or slightly wider than the head and are very inflated (see Figs. 1 and 5). The fifth segment is less than half the length and two-thirds the width of the preceding segments yet, like them, is very inflated. This inflation is due to the exceedingly large uteri of the female. The urosome is composed of four segments and tapers to the caudal rami. The first segment is long and exceeds the combined lengths of segments two and three and it carries the remarkably long curved egg sacs. The latter are attached to the anterior end of the segment in a dorso-lateral position. The fourth segment is also long but does not exceed the combined lengths of segments two and three. The caudal rami are the same length as the last segment of the urosome and each bears a caudal seta that is twice as long as the ramus. In addition there are three other caudal setae present which are arranged in the positions shown in Figures 1 and 5. The first antennae are six segmented, the second segment being the longest. The setation is as shown in Figure 8. The second antenna (Fig. 7) is prehensile