SEA-FISHERIES LABORATORY. 



289 



Oral sucker 



--Pharynx 



Excretory vessel 



Genital 



aperture 



—-Cirrus 



Prostate q land 

 ntesti ne 

 Seminal vesicle 



-Jgf-Ventral sucker 



Excretory vessel 

 -./-—Testes 

 ^--Uterus 



■■ Ovary 



Vite liana 



--Uterus 

 Excretory vessel 



Fig. 18. Derogenes various, x 75 dia. 



