273 POUCHET AXD VERllIEll, ON THE 



cercus, even whilst still within the cyst in the calf, presents 

 all the distinctive characters of the adult Tania. 



" Thus, a tapeworm follows the use of both veal and beef, 

 but of a species which has always been hitherto erroneously 

 confounded with 2\ soUum. 



" In the actual state of science it may be affirmed as a fact 

 that T. solium is introduced into the hiiman system by the 

 pig, 2\ medio-canellata by the calf or ox, and Bothrioce- 

 phalus latus or Tcenia lata of the older writers (in Switzer- 

 land, Poland, and Sussia, &c.) by water. Man, therefore, 

 owing to his mixed diet, is obnoxious to true tapeworms 

 with a crown of hooks, like the Carnivora ; and to Bothrioce- 

 phali or tapeworms without that armature, like the lierbi- 

 vora [and, it might be added, like the fish] . The two former 

 enter with the flesh which he devoui's, the other by the water 

 which he drinks/^ 



Migration of Entozoa. Reply to M. V. Beneden^s Note. 

 By MM. Pouchet and Verrier. 



Our doubts respecting the migrations of the Entozoa are 

 justified to some extent by those which have been expressed 

 by the two most celebrated French helminthologists them- 

 selves. Nevertheless we have not ventured to bring them 

 forward without long and laborious critical study and experi- 

 ment. 



Von Siebold regards Canurus cerebralis as the larva of 

 Tania serrata. Our experiments have been based upon the 

 data afforded by that zoologist, undoubtedly the best informed 

 and the most illustrious amongst all who have occupied them- 

 selves in the study of these transmigrations. Consequently 

 we cannot plead guilty to the charge of error brought against 

 us by M. V. Beneden. 



TcBnia Ccenurus has never been a species distinct from Tania 

 serrata, nor even has it been so regarded by several of the 

 zoologists or physiologists who have written or experimented 

 since the learned Belgian professor. Some of them, amongst 

 whom may, in particular, be cited Yon Siebold, even regard 

 this same Tama of the dog and that of man as belonging 

 absolutely to the same species. 



In the works of experimenters a lamentable confusion 

 exists with respect to the determination of the species, some 



