90 VETERINARY PARASITOLOGY 
of the intestine. In other cases the worms lie free in 
the bowel lumen. In length it ranges from 4} to 1 inch. 
The terminal segment is by far the largest, and contains 
the mature ova. 
The cystic form is the Echinococcus veierinorum, 
which may be found in various organs of the body— 
liver, lungs, ovaries, etc.—in cattle, pigs, and other 
animals. 
The cysts may be single or multi- 
locular, and may be few in number or 
present in sufficient quantity to com- 
pletely deform the organ in which they 
are contained. Their contents consist 
of clear, limpid fluid. 
A cyst-infested liver in the ox may 
weigh Ioo pounds. 
Tenia Serialis—This worm seldom 
exceeds 2 feet in length, and is not very 
commonly found. 
The head carries twenty-five to thirty 
hooks, the smaller ones having bifid 
guards. The segments are long and 
narrow. The intermediate host is a 
rodent, such as a rabbit or hare, and 
the Ccenurus is found attached to 
connective tissue, often between the 
muscles, or occasionally in the brain. 
Unlike Cenurus cerebralis, this cyst 
frequently buds off internal or external daughter cysts, 
containing numerous scolices. This cyst does not pro- 
duce gid in sheep, even when attempted experimentally. 
Tenia Coenurus.—In length this worm seldom exceeds 
zt yard. Itis not common. The head bears twenty to 
thirty hooks. The segments are very much wider than 
long, and much resemble those of Tenia serialis. The 
uterus gives off about twenty ramifying branches. 
Fic. 25,—TNIA 
EcHINOCOCCUS. 
