640 - Heredity and Evolution 



BLADDER WORM, IN CYST 

 (PIG MUSCLE) 



ONCOSPHERES, 



BLOOD VESSEL 



EVERTED CYST 

 ADULT WORM 



i _ leu^uis radkww, 'St 



CONTAMINATED FOOD 



Fig. 32-17. Life cycle of the "pork tapeworm" (Taenia solium). Careful meat inspection has reduced the inci- 

 dence of this cestode parasite; but still it is not safe to eat undercooked pork. 



