4 
Page. 
Venal distomatosis 49 
Schistosomidse 50 
Genus Schistosoma 50 
The human hlood fluke, Schistosoma hxmatobiiim 50 
Bibliography 53 
Index to zoological names 57 
Index to authorities cited 65 
ILLUSTRATIONS. 
1-4. The eye distome, Agamodistornum ophthalmohium. Plate. 
1. Ventral tdetv oi Agamodisiomum ophthalmohium 1 
2. Dorsal view of same 1 
3-4. Two other views of same in different stages of contraction 1 
5-16. The parasitic lung fluke, Paragonimiis icestermanii. 
5. The lungs of a hog, showing the cysts caused by infection with lung 
flukes 2 
6. A portion of a hog’s lung, containing a lung fluke cyst, which is here 
cut open 3 
7. Six lung flukes from hogs 3 
8. Contents of a lung fluke cyst, containing eggs of the lung fluke 3 
Page. 
9. Section of a cyst from a cat’s lung, with two lung flukes 14 
10. Section of a cyst from man, with one lung fluke 15 
11. Sputum of man containing lung fluke eggs 16 
12. Egg of the lung fluke, greatly enlarged 17 
13. Ventral view of a compressed Inng fluke from the hog 17 
14. Ventral view of a lung fluke from man, showing anatomy 18 
15. Dorsal view of same 18 
16. Egg of lung fluke containing ciliated embryo 18 
17-18. The giant liver fluke. Fasciola gigantica. 
17. The giant liver fluke, natural size 19 
18. The same enlarged to show the anatomy 19 
19-38. The common liver fluke. Fasciola hepcdica. 
19. The common liver fluke {Fasciola hepatica)^ natural size 22 
20. The common liver fluke, enlarged to show the anatomic characters 23 
21. Egg of the common liver fluke examined shortly after it was taken 
from the liver of a sheep 24 
22. Egg of the common liver fluke containing a ciliated embryo (mira- 
cidium), ready to hatch out 24 
23. Embryo of the common liver fluke boring into a snail 25 
24. Sporocyst of the common liver fluke which has developed from the 
embryo and contains germinal cells 25 
25. Sporocyst of the common liver fluke, somewhat older than that of flg. 
24, in which the germinal cells are giving rise to redije 25 
26. Redia of the common liver fluke, containing germinal cells which are 
developing into cercariae 25 
27. Redia of the common liver fluke, with developed cercarise 26 
28. Free cercaria of the common liver jfluke, showing two suckers, intestine, 
large glands, and tail 26 
