PARASITOLOGY. 161 
FASCIOLIDAE. 
The family Fasciolidae belongs to the order 
Trematoda and includes the genus Distoma. 
THE FLUKES. 
(Dis—twice) 
Distoma HeEpatTicum (Stoma—mouth) 
(Hepatic—tiver) 
Synonyms.—Fasciola Hepaticum. Liver Fluke. 
Distribution.—Found in the low-lying lands of the 
United States where the weather is warm and con- 
ditions are favorable for the development of the lar- 
val state. Also found in the low-lying land of Scot- 
land and other countries. 
Description—The body is flat and leaf-like; it is 
oblong, larger and rounder in front; at the extreme 
anterior end it is abruptly contracted in such a way 
as to present a conical neck; it terminates ob- 
tusely behind. The antero-posterior diameter is 
about one to one and one-fourth inches; the width 
measures one-third to one-half inch. It is provided 
