HYDATIDS OF THE SHEEP. 



161 



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 



Pig. 110. — A, brain ot a sheep whicli three weeks previous hadewallowed some eggs 

 of T. cmnnru^, and which was lolled after liaving shown all the symptoms of " stag- 

 gers." B b, isolated gallery formed hy the worm at the surface of the brain, the sco- 

 Tex being found at the end of the gallery. Be, vesicle (proscolex) before the birth of 

 the scolex. B d, vesicle in which the scolices will appear, (7, vesicles which have 

 produced some scolices. D, the hydatid vesicle containing 9(7, the secondary vesicles. 

 S, scolex of T. c^nurus, corresponding to a secondary vesicle D q, and very much 

 magnified and invaginated. a, point at which the head of the worm will issue out ; 

 h. point of junction with the hydatid vesicle ; c, hooks ; rf, the suckers ; e, the neck ; 

 /, 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 CaryophyUmusi, in 

 which the body is not jointed in the adult, though it is so 



