SIXTEN BOCK, TWO NEW COTYL. GEN. OF POLYCLADS. 7 



filled witli a large mäss of spermatozoa. This large reservoir, 

 which is unpaired and situated in the median line, corres- 

 ponds in function to the paired false seminal vesicles of some 



Äcoiylea. Morphologically it represents a dilatation of an 

 unpaired vas deferens. 



The true seminal vesicle is situated in front of this 

 spermic reservoir. In size this seminal vesicle is far less than 

 the spermic reservoir; in shape it is elliptical in outline. It 



