IVORMS, CRJYFISH, CENT/PEDS, ETC. 



147 



the pond, where it moves about hunting for a host in 

 which to take up its abode. 



The terrible Tricliina spu-alis, which produces the dis- 

 ease called trichinosis, is another roundworm of which 

 much is heard. This very small worm lives in its adult 

 condition in the intestine of man as well as in the pig 



Fig. 108. 



FiL, 109 



Fig. 108. — A vinegar eel, AnguiUuIa sp. (Much enlarged; from a living 

 specimen. ) 



Fig. 109. — Trichina spiralis, encysted in muscle of a pig. (Greatly magni- 

 fied; from specimen.) 



and other mammals. The young, which are born alive, 

 burrow through the walls of the intestine, and are eitlier 

 carried by the blood, or force their way, all over the body, 

 lodging usually in the muscles. Here they form for 

 themselves little cells or cysts in which they lie (fig. 109). 



