Abstract
In trematodes of the family Schistosomatidae it has long been considered that there is complete separation of sexes, in contrast to the hermaphroditic condition occurring in other families of flukes. However, recent reports on hermaphroditic tendencies in males of the genus Schistosoma (Vogel, 1947; Short, 1948a; Gonnert, 1949; and Lagrange and Scheecqmans, 1949) indicate that sex separation is not always complete in this genus. Observations reported in the present paper show that in the genus Schistosomatium, also, separation of sexes is not always complete. During a study to be reported elsewhere (in press), the writer had occasion to examine a large number of stained male and female Schistosomatium douthitti from deer mice. These were searched carefully for any evidence of hermaphroditism, with the result that certain females were observed to possess, besides ovaries, discrete cellular bodies which on further study proved to be immature testicular follicles. The present paper is concerned with these hermaphroditic females.
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