TEANSLATIONS. 



On the Transmigration of the Entozoa. 



The following is a summary of M. V. Beneden^s remarks 

 upon tlie communication of MM. Pouchet and Ferrier, given 

 in our last number. 



MM. Pouchet and Verrier state that^ according to M. V. 

 BenedeUj tlie Canurus cerebralis is the larva or scolex of Tarda 

 serrata. But in order to show that that is not his opinion, 

 the latter remarks that_, in his ' Memoire sur les Vers intesti- 

 naux/ as well as in the ' Zoologie Medicale/ the tapeworm 

 derived from that cystic form figures as a distinct species, 

 under the name of Teenia ccenurus, whilst that which is de- 

 rived from Cysticercus pisiforniis is denominated T. serrata. 



In M. Van Beneden's opinion it is owing to the circum- 

 stance of their not having distinguished these two species 

 that MM, Pouchet and Verrier were unsuccessful in their 

 principal experiment, induced by the results of which, mainly, 

 they have ventured to express doubts with respect to the doc- 

 trine of the metamorphoses of the Entozoa, and their peregri- 

 nations through the organism. 



Whence do these doubts arise ? 



1. In one of their first experiments they administered 600 

 heads of the Ccenurus, and obtained 36 Tanias. On another 

 occasion, from 60 heads of the same Entozoa they had 51 

 Tanias. In a third experiment, 60 heads produced 78 

 Tcenias ; and in a fourth instance, having given 100 heads to 

 a sucking puppy, which was isolated, they found 237 Tcenias. 



How was it that in the latter two cases the number of tape- 

 worms was greater than that of the heads which they thought 

 they had given ? "1 cannot explain it,^' says M. V. Beneden, 

 " but have no doubt whatever that, if they continue their in- 

 quiry, with the same precautions to ensure precision in their 

 experiments, these gentlemen will, before they have done, 

 themselves discover the explanation of this apparent excess." 



" 2. MM. Pouchet and Verrier administered to two lambs 

 some perfectly matured ova of Tania serrata, and, notwith- 



