38 



THE LIVER-FLUKE. 



The vasa deferentia are two in number, one arising 

 near the middle of each testis. They run forwards 

 as far as the ventral sucker, where they open into 

 the vesicula seminalis. 



Fm. 16.- 



-Fasciola hepatica. Reproductive organs, from the ventral 

 surface : x 6. (After Sommer.) 



CS, cirrus-sac. D, ductus ejaculatorius. F, aperture of the oviduct. 

 O, ovary. OD, ovarian duct. P, penis. S, shell-gland. T, anterior testis. 

 U, uterus. VA, vas deferens from anterior testis. VP, vas deferens from 

 posterior testis. VS, vesicula seminalis. Y, yolk-gland. YD, duct of yolk- 

 gland. 



