288 



ZOOLOGY 



SECT. 



One of the most terrible parasites of man is Trichina spiralis 

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

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



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Tig. 234. Trichina spiralis. A, encysted form, in muscle of host ; B. female ; C. male. '</<. 

 connective tissue eiivel.'pe ; cy. cyst': de. ejaculatory duct ; c. embryos ;/. fat globules; It. 

 testis ; /. ,r. muscle fibre ; o, pharynx ; ov. ovary ; c-". gunnpurc ; .:/<. CL-ll-ni;isses in intestine. 

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



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 



