'^DISEASES OF THE DIGESTIVE ORGANS. 



ni 



masses of dung, in little pouches and closed cysts of the mucous 

 membrane of the large intestine, and in dilatations of the blood- 

 vessels, especially the arteries of the bowels. This, with two 

 other common pin-worms of the horse (Sclerostomum Tetra- 

 canthum, Oxyuris Curvula) are each about an inch in length, 

 and all inhabit the large intestine in their adult condition, 

 sometimes becoming so numerous in a district as to cause an 

 epizootic Another round worm (Ascaris Megalacephala) about 

 six inches long is very common in the horse's small intestine. 



Cattle suffer less from intestinal worms, but the following are 

 not infrequently injurious, especially to calves. The long tape- 



lijj. 29. — Head of Echinorynchus 

 (iigas. 



Fig. 30.-Spiroptera Strongylina ; ^'S- 3i-- Ascaris Suilla. 



a, nat. size; b, tail enlarged. 



worm (Taenia Expansa), Ascaris Bovis (like a common earth- 

 worm), the hair-headed worm (Tricocephalus Affinis), the 

 Sclerostomum Hypostomum, and Strongylus Radiatus. 



Sheep suffer severely, especially from the long tape-worm, 

 .sclerostomum Hypostomum, Strongylus FillicoUis, S. Contortus, 

 Dochmius Cemuus, and Triocephalus Alhnis. The thick 



M 



