TEEMATODE PARASITES. 



59 



The excretory vesicle is V-sbaped, the main stem being very 

 short. 



The testes axe two elongated oval bodies, measuring about 

 ■025 X -014 mm. That on the left lies on the same level as the 

 ventral sucker, the one on the right being somewhat behind. The 

 vesicula seminalis lies adjacent to the anterior border of the 

 ventral sucker, and from its anterior end issues the pars prostatica. 



Text-fig. 11. 



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/ \ 



i) 



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Gymnophcdlus affinis, sp. n. Ventral view, X400. 

 Ov. Ovary. T. Testes. V.S. Vesicula seminalis. 



The ovary is considerably larger than the testes, measuring 

 •027 X -023 mm., and is more nearly globular. It is situated 

 almost immediately in front of the right testis and on the level 

 of the anterior border of the ventral sucker. The yolk-glands lie 

 over the anterior half of the ventral sucker. Each gland consists 

 of a somewhat crescentic mass of very irregular contour, the con- 

 cavities of the crescent being directed outwards. 



The uterus lies mostly behind and to the left side of the 



