422 



THE ANIMAL PARASITES OF MAN 



encyst in the muscular system, but are expelled with the faeces. By 

 cold-blooded animals as well as by insects (Calliphora vomitaria) 



FIG. 302. Trichinella spiralis. ? , mature female : E, embryos ; V, vulva ; Ov, ovary. 

 3 , mature male : T, testes. c., newly born larva, d., larva in the muscles. ., encapsuled larva 

 in the muscles. Magnified. (After Glaus.) 



encysted Trichinellse are evacuated without undergoing any change, 

 but they will still develop if subsequently ingested, say, by rabbits. 

 According to Gujon, however, Trichinella can develop in salamanders, 



