288 



ZOOLOGY 



SECT. 



One of the most terrible parasites of man is Trichina spirtilis 

 (Fig. 234), a minute worm, the male (C) a little over 1 mm. ( T V in.) 

 in length, the female (B) about 3 mm. (-|- in.). In the adult or 



Fig. 234. Trichina spiralis. A, encysted form, in muscle of host ; B, female ; C. male. Mi. 

 connective tissue envelope; cy. cyst; >/>. ejaculatory duct ; c. embryos ; /'. fat globules; /;. 

 testis ; m. r. muscle fibre ; o<i pharynx ; or. ovary ; vo. gonopore ; zli. cell-masses in intestine. 

 (From Lang's Comparative Anatomy, after Claus.) 



sexual condition it lives in the intestine of Man, the Pig, and other 

 mammals. Internal impregnation takes place, the eggs develop in 

 the uterus of the female, and the minute young (B, e.), to the 



