PARASITOLOGY. 167 
enters, are swollen and appear slate colored or black. 
The serous membrane adjacent to the liver is slate 
colored. The young flukes may migrate through the 
diaphragm and become lodged in the posterior lobe 
cf the lung, where they form a cyst as in the liver; 
the attention is first attracted to the infested part by 
the interlobular substance being stained dark, often- 
times black; upon closer examination a tumefaction 
is found which, when sectioned, is found to contain 
the characteristic cyst. The adult fluke lives about 
six months. The symptoms and general debilitating 
conditions are the same as in infestation with the 
Distoma Hepaticum. Often cattle are infested with 
both Distoma Hepaticum and Distoma Americanus. 
Distoma LANCEOLATA (Lancea—lance). 
Distribution.—Found in countries and localities 
where the preceding species are found. 
Description.—The body is lancet shaped, brownish 
in color and semi-transparent; when the uterus is 
filled with ova the body presents a mottled appear- 
ance, on account of the fact that the integument is 
semi-transparent. The intestinal tract consists of 
two non-ramifying branches. The adult is from one- 
third to one-half inch in length and one-tenth inch 
wide. 
Lite Cycle.—The life cycle is the same as in the 
preceding species; the ovum undergoes segmenta- 
tion and develops embyos in the maternal body, but is 
not hatched until it has been in water three weeks. 
The embryo is globular or pyriform in shape, ciliated 
on the anterior third of the body, and armed with a 
sharp protractile and retractile cephalic needle. 
