12 
BULLETIN 260, U. S. DEPARTMENT OF AGRICULTURE. 
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 
