3°6 



MANUAL OF ELEMENTARY ZOOLOGY 



host. — Ascaris. Trichocephalus (male 30-45 mm., female 35-50 mm.) 

 lives in the human caecum, appendix, and colon , attached by its long whip- 



FlG. 217. — Trichinella spiralis, young encysted in muscle of host. 

 From Thomson, after Leuckart. 



Fig. 218. — Trichocephalus dispar. — From Sedgwick, after Leuckart. 



.», Egg ; i, female ; c, male, with forepart of t|ody buried in mucous membrane 

 of host ; Sf, penia seta. 



