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). 



Distribidion. — 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 

 ia 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. 



Life 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 o^zz \ 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 Infested. — The dog. 



Parts Infested. — The esophagus and stomach. 



Conditio7i 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 ^ZZ. 

 A cavity in the center of the tumor may contain as 

 many as twenty worms. There is usually an open- 



