ORIGIN OF CYSTICA AND CESTOIDEA. 



69 



Fig. 29. 



Fig. 30. 



4. EXPERIMENTS ON FEEDING WITH CCENURUS CEREBRALIS. 



In order to make as sure as possible with these experiments, I 

 took dogs, which I had selected for feeding, into the country 

 with me, to the very place 

 where there were sheep affected 

 by the staggers, and let them 

 swallow the cystic worms 

 fresh from the sheep affected 

 with the disease, that had just 

 been killed. If the parental 

 vesicle were small, and only 

 covered by a few clusters of 



scolices, they were left in connection with it ; but if the parental 

 vesicle had attained a considerable size, it was divided and given 

 in portions to several dogs. (Fig. 29.) 



Fig. 31. 



Fig. 32. 



Fig, 33. 



Fig. 29. A portion of the parental vesicle with an attached colony of involuted scolices 

 of Coenurus cerelralis from the brain of a calf, seen from the external surface, of the 

 natural size. Each of the separate rounded corpuscles corresponds with a scolex 

 developing or developed by internal budding : a, a complete involuted scolex ; 6, a still 

 imperfect involuted scolex ; c, many scolices commencing their development. 



Fig. 30. A bit of the parental vesicle with a colony of everted scolices of Coenurus 

 cerelralis from the brain of a calf, seen from the external surface, and of the natural size. 



Fig. 31. An everted scolex detached from its parental vesicle (fig. 30), and mag- 

 nified to the same extent as the succeeding figures, a. The protruded double circlet of 

 hooks on the cephalic extremity. 6. One of the four cephalic suckers, c. Fragment of 

 the detached parental vesicle. 



Fig. 32. The head of a similar scolex seen from above ; the double circlet of hooks 

 surrounded by the four suckers is seen in the middle. 



Fig. 33. Various hooks from the double circlet of the scolices of Coenurus cerelralis. 

 a. A long hook of the inferior circlet seen from below. 5. The same from the side. 

 c. A short hook of the lower circlet also viewed laterally, d, e. Two not yet fully 

 developed and soft hooks from the young buds, fig. 29 c. 



