ANIMAL PARASITES 255 



I Sheep 



Species Organ 



Haemoncluis contortiis Al)omasum 



Ascaris ovis Small intestine 



Strongylus filicollis Small intestine 



CEsopliagostomuni colunibianum Intestines 



Uncinaria cernua Small intestine 



Trichocephalus aflins Large intestine 



Strongylus filar ia Eronclii 



Strongylus rufescens Bronchi and air follicles 



Swine 



Species Organ 



Ascaris suis Intestines 



(Esophagostomum dentatum Large intestine 



Trichocephalus crenatus Large intestine 



Trichina spiralis Muscles and intestines 



Strongylus paradoxus Trachea and bronchi 



Sclerostoma pingencola Renal fat and kidney 



Poultry 



Species Organ 



Ascaris inflexa Intestine 



Spiroptera hamulosa Gizzard 



rieterakis papillosa Caecum 



Syngamus tracheal is Trachea and bronchi 



Intestinal Worms of Solipeds. — The large round-worms or 

 ascarides and the sclerostomes are the most injurious intestinal 

 parasites of solipeds. The A. megalocephaJa or large round- 

 worm is from 5 to 15 inches (12 to 35 cm.) long. It may be 

 present in the double colon in such large numbers as to form 

 an entangled mass that completely fills a portion of the loop in 

 which it is lodged. It may interfere with digestion by obstruct- 

 ing the passage of alimentary matter, and irritating the intestine. 

 The S. equinum and S. tetracanthum are small worms. The 

 former sclerostoma is from O.G to 1.5 inches (18 to 35 mm.) 

 long, and the latter is from 0.5 to 0.6 inch (8 to 17 mm.) long. 

 Both sclerostomes attach themselves to the lining membrane of 

 the intestine by their mouth parts, and suck blood. The young 

 S. equinum may live in tumor-like cysts that they cause to form 

 in the lining membrane of the intestine. The young worm may 

 penetrate the wall of a small blood-vessel as well, and drift 

 into a large vessel, where it may become lodged and undergo 



