NEMATODA. 833 



the large intestine, where they attain sexual maturity, 

 and then leave the mucous membrane and enter the 

 alimentary canal. 

 Species (c.) 8. dentatus of pig ; found in large intestine. 



„ {d.) S. syngamus, from the trachea and bronchial tubes of fowls, 



„ (e.) S. radiatiis of the ox, and several other ruminants. 

 From the small intestine and colon. 



„ {/.) S. venulosus of the goat; found in the small intestine. 



„ {g.y S. micrurus of cattle, horse, and ass; found in aneu- 

 risms of the arteries of the cow, and in the trachea 

 and bronchial tubes. In the tough, yellow mucus of 

 the air passages and bronchi they are to be found 

 in countless numbers. 

 Species (Ji.) S. filaria of sheep and goat, camel, &c. ; found in the 

 trachea, bronchial tubes, and lung-parenchyma. The 

 ripe worms are coughed up and die. From the 

 bodies of the dead females the embryos come forth. 

 When they get into water they develop further, and 

 live as free neq|pfcodes (or possibly as parasites on an 

 intermediate host). These gain access to the stomach 

 of the sheep with the water, wander into the lungs, 

 and encyst in the parenchyma. When mature they 

 leave the parenchyma for the bronchi. The forms 

 described as Nematoideum ovis pulmonale are con- 

 . / sidered as embryos of S. filaria. 



„ («.) S. paradoxus of the pig ; found in the trachea and 

 bronchial tubes. 



„ (k.) S. filicollis of the sheep ; met with in the small intestine. 



„ {I.) S. venti'icosu^ oi cattle ; found in small intestine, 



„ (m.) S. infl,atus of cattle, rare; found in colon. 



„ in.) 8. contortus of sheep and goat ; found in the abomasum, 

 usually associated with >S^, filaria. 

 Stephanurus dentatus of pig ; found in or about the 

 kidneys. The kidney- worm of the Americans; Leuck- 

 art's Sclerostoma pinguicola^T' 



Genus Trichina. 

 Species (a.) T. spiralis ; sexually mature adults in alimentary canal 

 producing living young, which bore their way into 

 the muscles and encyst, forming the immature larval 

 T. spiralis or Muscle Trichina ; found in man, pig, 

 ox, rabbit, rat, &c. 



