POLYCLAD FLATWORMS — ^HYMAN 



69 



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v» . 



a 



Figure 2. — a. Enlarged view of tentacular and cerebral eyes of Discocelis insularis; b, 

 enlarged view of anterior end of juvenile latocestid; c, parasagittal view of penis of D. 

 insularis. (For explanation see page 66.) ? 



and parallels the wall of the muscular pocket of the male antrum 

 mentioned above. It then arches posteriorly and narrows to a 

 straight slender tube that continues posteriorly after receiving into 

 its ventral wall the common oviduct, and finally opens into a large 

 Lang's vesicle of irregular form lined by a tall epithelium. Because 

 of poor histological preservation it was difficult to determine whether 

 the Lang's vesicle sends forward a pair of horns as usual in the genus, 

 but this seemed to be the case. The irregular form of the Lang's 

 vesicle is imusual in the genus. 



