120 



PARASITES OF MAN 



the maternal endocyst. In the scolex there exists a circular 

 channel immediately below the rostellum, and this ring, on 

 either side, gives off two vessels which pass downwards in a 

 tortuous manner, internally, until they arrive at the pedicle 

 where they unite to form two channels, which latter are 

 continued into the vascular system of the maternal endocyst. 

 In the retracted condition their position, of course, becomes 

 very much altered, and they form loops on either side of the 

 central line which marks the space leading down to the 

 inverted head. Neither Prof. Huxley nor myself have seen 

 these vessels, which Leuckart observed in the scolex itself, but 

 Huxley discerned some apparently loose cilia in the granular 

 parenchyma of the body ; their longitudinal measurement being 

 about the of an inch. 



FIG. 34.- 



-An Echinococcus brood-capsule (flattened by pressure). Magnified about 120 diameters. 

 From a drawing by Professor Busk. 



As regards the production of " nurses " by the phenomenon 

 of proliferation, I can only remark that the endocyst is 

 primarily concerned. The secondary and tertiary vesicles must 

 be regarded as so many special bud-developments which, instead 

 of becoming brood-capsules, become daughter-vesicles and 



