Diseases of the Digestive Organs. 



177 



an incli 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 com- 

 mon in the horse's small intestine. 



Cattle suffer less from intestinal worms, but the foU(jW- 

 ing are not infrequently injurious, especially to calres. 

 The long tape-worm (Taenia Expansa), Ascaris Bovis (hke 

 a common earth-worm), the hair-headed worm (Tricoceph- 



Fig. 29. V Fig. 31. 



Ffg. 29 — Head of Echinorynchus 

 Gigas. 



Fig. 30; 



Fig. 30 — Spiroptera Strongylina; Fig. 31 — Ascaris Suilla. 



a, nat. size ; i, tail enlarged. 



alus Affinis), the Sclerostomum Hypostomum and Stron- 

 gylus Kadiatus. 



Sheep suffer severely, especially from the long tape- 

 worm, Sclerostomum Hypostomum, Strongylus FillicoUis, 

 S. Contortus, Dochmius Cernuus and Tricocephalus Affinis. 

 The thick portion of the body of the last is about an inch 

 long, the other round worms are mostly under an inch and 

 a half. The tape-worm is usually three feet or under, but 

 is alleged to gain a length of twenty, thirty and even one 

 hundred feet. 



