TREMATODE PARASITES. 61 



to have much the same disposition with regard to the ventral 

 sucker as in Gymnophallus affinis, the ovary lying on the right 

 at the level of the anterior border of the sucker, the right testis 

 being at the posterior border and the left testis occupying an 

 intermediate level. The yolk-glands differ from those in 

 G. affinis in being much more compact, their outlines, in fact, 

 being quite oval. They usually lie over the anterior half of the 

 ventral sucker or a little in front of it. 



Text-fiff. 12. 



I 



I ( 



1 I / 



1 



-v.s. 



Ov- 



.-'T. 



Gymno'plialhis macroporus, sp. n. Ventral view, X 250. 

 Oi\ Ovary. T. Testes. V.S. Vesicula seminalis. 



The vesicula seminalis lies immediately in front of the yolk- 

 glands, sometimes median, at other times displaced laterally. 

 From its anterior end issues a short wide pars prostatica, running 

 doAvn towards the ventral sucker. The uterus is disposed around 

 the ventral sucker and does not extend in front of the intestinal 



