CYSTICERCOSIS. 



291 



erroneous idea that the pork-measle tapeworm occurs m dogs aw well 

 as in man. 



Life history. In tracing the life history it is best to Itegin with the 



Fig. 137.— Small and large hooks of (A) Tcenia marrjiiuila, (B) T. serrata, and (C) 

 T. canurus. u, Small hooks ; 6, large hooks, x 480. (After Deffke.) 



egg, produced by the adult tapeworm in the intestine of dogs. These 

 eggs, containing a six-hooked embryo, escape from the dog with the 



Fig 138 -Sexuallv mature segment of the mar.inate tapeworm (Ta;u„ mar;nn„la). 

 0, Cirrus pouch ; (jp, genital pore ; u, nerve ; ov, ovary ; sg, shell gland ; t, testicles ; 



cp 



ov, ovarj' ; 

 tc transverse canal; nt, uterus; .•, vagina; rr, ventral canal; 

 vg, vitellogene gland. Enlarged. (After Deffke.) 



r(J, vas deferens '< 



