448 EXPLANATION OF THE PLATES. 



Fig. 11, b. Water vascular-system and organ of excretion. 



c. c. Yelk-sacs. 



d. Horizontal efferent duct of the same. 



e. Uterus. 



f. Point at which the eggs become brown-red. 

 ff. Vagina. 

 h. Ventral sucker. 

 i, i. Testes with efferent ducts. 



k. Vesicula seminalis exterior (sac of penis, cirrhus-beutel). 

 /. Vesicula seminalis interior. 

 12. Egg of this Distoma. 



PLATE (TAB.) VI. 



1. A male of Distoma hcematobium grasping the female in a gyno3cophoric canal. 



a. Head of female projecting from the canal. 



b, c. Tail of the same. 



b. Spot where the two branches of the divided intestinal tube unite. 



c. Spot where the united blind gut ends. 



d. d. The body of the enclosed female within the male. 



e. The chink of the gynoecophoric canal closed. 

 f. The same somewhat open. 



ff. Base of the canal. 

 h. Seat of the male genitalia. 

 a. Oral sucker of the male. 

 k. Stomach of the same. 



2. Anterior portion of the body of the male of Distoma hcematobium viewed from 



the ventral aspect. 



a. Oral sucker. 



b. Ventral sucker. 



c. Dichotomous intestinal tube. 



d. Sac of the penis. 



e. Testes. 



3. Anterior portion of the female. 



a. Mouth. 



b. Ventral sucker. 



c. Opening of the oviducts. 



d. Division of the intestinal tube. 



e. Eggs in the oviducts. 

 /. Oviducts. 



4. Egg of the same from a calcified tubercle from the liver. 



5. Egg from an open vessel in the intestinal mucous membrane. 



6. Egg with the living embryo. 



7. Egg with the escaping embryo. 

 8 9. Free embryos. 



1012. Empty egg-shells. 



13. Young animal in larva-case. 



14. Young animal, a quarter of an hour after hatching. 



