HYDATIDS OF THE SHEEP. 119 
ing the colony. This hydatid also infests cattle, the horse, 
goat, various species of antelope and deer, the dromedary, 
and, it is said, the rabbit. ‘‘ In the sheep the disease is rec- 
ognized at first by a heavy, stupid, wandering gait, which 
Fig. 80. —A, brain of a sheep which three weeks previous had swallowed some eggs 
of 7. cenurus, and which was killed after having shown all the symptoms of ‘ stag- 
i B }, isolated gallery formed by the worm at the surface of the brain, the sco- 
ex being found at the end of the gallery. Bec. vesicle (proscolex) before the birth of 
the scolex. Bd, vesicle in which the scolices will appear. (, vesicles which have 
ee some scolices. D, the hydatid vesicle containing gg, the secondary vesicles. 
, scolex of 7'. cwnurus, corresponding to a secondary vesicle D g, and very much 
magnified and invaginated. a, Font at which the head of the worm will issue out 5 
5. point of junction with the hydatid vesicle ; c, hooks ; @, the suckers ; e, the neck 5 
J, the wall of the hydatid cyst.—After Beneden. : 
is frequently succeeded by irregular, tortuous, whirling 
movements of the body, accompanied with convulsions (Cob- 
bold). 
The simplest form in the order is Caryophylleus, in 
which the body is not jointed in the adult, though it is so 
