INTERNAL PARASITES — 199 
lungs, air sacs, hollow bones and the peritoneum. They have been 
reported as occurring exceptionally in the heart, liver and kidneys. 
Their presence within tissues is 
not readily explainable since 
their structure is not adapted to 
the penetration of tissue. They 
are most commonly noted in the 
air sacs. Hens apparently in 
perfect health may be heavily in- 
fested, so that the economic im- 
portance of the parasite seems to 
be not very great. The method 
of transmission has not been thor- 
, oughly explained. Their exit 
from the body could occur 
through the trachea by expulsion 
é during coughing. 
Fie. 31. Cytodites nudus. Male, ven- A few writers have observed 
tral aspect. Enlarged 100 times. eases in which the parasites ap- 
(Railliet) . . 
pear to be of pathological impor- 
tance. Gerlach regarded them as the cause of enteritis as did also 
Zundel. Williams attributed high importance to them as a parasite 
a Ba aad Ye 
Fie. 32. Cytodites nudus. Ovigerous female, ventral aspect. Enlarged 100 
times. (Railliet) 
