PARASITOLOGY. 135 



ScLEROSTOMA Hypostomum (hypo — under, stoma — mouth) 



Synojiyui. — Chabertia ovina. 



Distribution. — Found in the United States and 

 Europe. Not very common. 



Description. — The body is thread-like, white in 

 color and rigid ; the head is slightly globular ; the 

 mouth parts are provided with a double row of mem- 

 branous teeth; the head is surrounded by six papillae; 

 the caudal pouch is short and gives the male a cut 

 off appearance; the tail of the female terminates in 

 a blunt point. The male is three fifths of an inch in 

 length, the female about one inch. 



Life History. Mode of Infestation. — The female is 

 oviparous, the ova pass out to the ground with the 

 feces; the embryos after emerging from the ova go 

 through certain changes and are then taken in by 

 the host through the food and water. Upon reach- 

 ing the intestinal tract they develop into the mature 

 form. 



Animals Infested. — The sheep and goat. 



Parts Infested. — Small and large intestines. 



Condition Produced. — By means of the buccal arm- 

 ature they hold on to the mucous membrane and suck 

 the blood; punctiform hemorrhages have been noted 

 in the intestinal mucosa ; when in large numbers 

 they cause disturbance in digestion, a general un- 

 thrifty appearance, diarrhoea, emaciation, anemia 

 and possibly death. These wounds often furnish 

 channels through which infection may take place. 



Treatmeiit. — Physic and gasoline are prescribed as 

 in infestation with the Strongylus Contortus. 



( Dentos — toothed ) 

 Stephanurus Dentatus (Stephanos — a crown) 



(Oura — a tail). 



