II YD AT IDS 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 



Fig. 110. A, brain of a sheep which three weeks previous had swallowed some eggs 

 of T '. ccenurus, and which was killed after having shown all the symptoms of " stag- 

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

 lex 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. C, vesicles which have 

 produced some scolices. D, the hydatid vesicle containing go, the secondary vesicles. 

 E, scolex of T. ccenurus, corresponding to a secondary vesicle D g, and very much 

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

 b. point of junction with the hydatid vesicle ; c, hooks ; d, the suckers ; e, the ueck ; 

 /, 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 Caryophyllceus, in 

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



