REPRODUCTION 



233 



the mature sperms are temporarily stored, The sperm duct 

 ends in an extensible copulatory organ for conducting the sperms 

 into the vagina of the same or another proglottid. Though 

 hermaphroditic, i.e., with both sexes in a single individual, a 



FIG. 84. Ripe proglottids of various tapeworms of man, drawn to scale accord- 

 ing to average measurements: A, Tcenia saginata (after Leuckart). B, Tcenia solium 

 (after Stiles). C, Dipylidium caninum (after Diamare). Z>, Tcenia confusa (after 

 Guyer) . E, Dibothriocephalus latins (after Leuckart) . F, Diplogonoporus grandis 

 (after Ijima and Kurimoto). G, Dibothriocephalus cordatus (after Leuckart). H, 

 Tcenia africana (after von Linstow). /, Hymenolepis diminuta (after Grassi). 

 J, Hymenolepis nana (after Leuckart). 



proglottid does not necessarily always fertilize its own eggs, 

 but cross-fertilization may often occur. This is generally in- 

 sured by the fact that the male reproductive system usually 

 becomes mature before the female. In the pork tapeworm, 



