CYSTICERCOSIS. 



291 



erroneous idea that the pork-measle tapeworm occurs in dogs as well 

 as in man. 



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



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

 T. coenunis. a, Small hooks ; 6, large hooks, x 480. (After Defifke.) 



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. — Sexually mature segment of the marginate tapeworm (Tcenia marginata). 

 cp, Currus pouch; gp, geniteJ pore ; n, nerve ; ov, ovary ; sg, shell gland ; t, testicles ; 

 tc, transverse canal; nt, uterus; v, vagina; vc, ventral canal; vd, vas deferens* 

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



U 2 



