ETDATID8 OF THE SHEEP. 



161 



ing the colony. This hydatid also infests cattle, the horse, 

 goat, vai'ious 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.—^, brain of a sheep which three weekg previous had swallowed some eggs 

 oi T. canurus, 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 eco- 

 lex being found at the end of the gallery. Be, vesicle (proscoles) before the birth of 

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

 OToducedfiomescolices. i>, the hydatid vesicle contaimng f?^?, the secondary vesicles. 

 X scolex of T. ccenurus. corresponding to a secondary vesicle Z) 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, l^ooks ; d, the suckers ; e, the neck ; 

 /, the wall of the hydatid cyst.— After IJeneden. 



is frequently succeeded by irregular, tortuous, whirling 

 movements of the body, accompanied with convulsions (Cob- 

 bold). 



The simplest form in the order is Caryophyllmus, in 

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



