240 



ENTOZOA. 



came feverisli, declined, and died (as happened in the first experi- 

 ment) three weeks after the commencement of the feeding. The heart 

 was found oedematously infiltrated, and occupied by many hundred 

 measle-cysts (Fig. 61) ; these pathological changes, in the opinion of 

 Mosler, having caused the animal's death." Taken altogether, 

 therefore, Leuckart's three separate experiments incontestably prove 

 the true source of our Tcunia medio caiiellata, and they demonstrate 

 the correctness of the persuasions previously entertained by 

 Kiichenmeister in the first instance, and by Huber and Schmidt sub- 

 sequently, respecting the bearers of the larvae. Another attempt by 









Tin 





Fig. 52. — Head of the larva (scolex, or Cysticercus) of the Tcenia mediocanellata ; from a specimen 

 prepared by Leuckart. Drawn with the aid of a camera (X 30 diam.) — Original. 



Leuckart to produce the measles of this tapeworm in the pig gave, 

 as before, only a negative result. 



Through the kindness of this distinguished zoologist, I am in 

 possession of several measles removed from one of these calves. 

 The characteristic hookless head, represented above, is that of a 

 cysticercus about twelve weeks old ; that is to say, it was arti- 

 ficially reared within the body of a calf, having been introduced 

 in the egg (or six-hooked embryonic) condition three months 

 before the animal's death. This larva, as in the adult worm, pre- 

 sents a truncated, flattened head, four large rounded suckers, a 



