THE 'REPRODUCTIVE SYSTEM 



29 



c. The vesicula seminalis is an elongated sac lying 



above, and somewhat in front of, the ventral 

 sucker. 



d. The ductus ejaculatorius is a fine tube running 



from the vesicula seminalis to the end of the 



VA 



IG . 7. Fasciola hepatica. Reproductive organs. (After Sommer.) 



CS, cirrus-sac. D, ductus ejaculatorius. F, female sexual aperture. 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 semiualis. Y, yolk-gland. YD, duct of yolk- 

 gland. 



