PARASITOLOGY. 93 
tumors in the wall of the stomach. Gastritis has been 
noted in severe infestations, in others there are ulcers 
in the mucous folds where worms are found, and 
still others no lesions. Sections from stomach wall 
has shown eosinophilia. 
Another worm, slightly smaller than this one, has 
been found in company with it, and has been called 
Physocephalus Sexalatus. 
SPIROPTERA SANGUINOLENTA (Sanguis—blood). 
Distribution.—North and South America, Asia and 
Europe. 
Description.—A thread-like worm, red in color. 
The male measures one to one and one-half inches 
in length; the female two to two and one-half 
inches. The tail ot the male is curved in a spiral 
manner and provided with two unequal spiculae; the 
tail of the female is straight or slightly curved. The 
vulva is situated about one-fourth of an inch poste- 
rior to the head. 
Lite Cycle.—The cockroach is the intermediate 
host. The roach finds the eggs of the worm in the 
feces of the dog. In the digestive tract of the cock- 
roach the embryo is liberated from the egg; the 
embryo burrows through the intestinal wall and 
becomes encysted in the abdominal cavity. The dog 
in turn eats the cockroach whose abdominal cavity 
contains these encysted larvae. 
Animal Intested.—The dog. 
Parts Intested.—The esophagus and stomach. 
Condition Produced.—The larva becomes lodged 
in the walls of the esophagus or stomach and causes 
a tumor which may reach the size of a pigeon’s egg. 
A cavity in the center of the tumor may contain as 
many as twenty worms. There is usually an open- 
