Abstract
O . parvicaudata. a larval trematode from Littorina littorea, L. saxatilis and L. obtusata at Woods Hole, Mass., and the sporocyst generation of the sp., are redescr. These larval stages are compared with those of C. roscovita, a closely related sp. from L. saxatilis on the coast of France. The morph. of the sporocysts and cercariae suggest that they are members of the family Plagiorchiidae,and provide clues for the elucidation of the life-history of the parasite.
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