12 



BULLETIN 260, U. S. DEPARTMENT OF AGEICULTUEE. 



differs from a hydatid or a ccenurus. Numerous cysts, however, may 

 be scattered through the musculature, so that in their numbers there 

 is a compensation, so to speak, for their small size and lack of a mul- 

 tiplicity of heads. Inasmuch as the presence of these cysts calls for 

 condemnation of a part or all of the infested carcass, according to 

 the degree of infestation, and the number of carcasses amounts to 

 20,000 a year, this parasite has considerable economic interest for 



Fig. 6. — Bladder worm (Cysticercus ovis), a tapeworm cyst infesting the meat of sheep. 



(From Ransom.) 



this country, and never more than at the present time when the 

 " high cost of living " is such a vital topic. 



When one of these cysticerci from mutton is ingested by a dog, 

 the tapeworm head passes undigested to the dog's intestine and 

 develops into a fairly large tapeworm, comparable to the gid tape- 

 worm. Similarly, this tapeworm, Tcenia ovis (fig. 7), produces eggs 

 which are passed out in the feces of the dog, and which are ingested 



