THE CYSTIC ENTOZOA. 481 



echinococci, and which are attached to the internal surface of 

 the membrane, are merely the young acephalocysts either of 

 the secondary or tertiary stages of development. They will 

 be, as already fully described in this paper, of the secondary 

 generation, if found growing from the walls of the original 

 containing sac, and tertiary if found growing from the walls 

 of those sacs floating free in the fluid contained within the 

 original sac. This animal is an acephalocyst, and not an 

 echinococcus. Bremser, in the atlas of his work, On the, 

 Intestinal Worms of Man, calls it an echinococcus, but upon 

 false grounds, for the proper definition of echinococcus, he 

 says, at p. 294 of his work alluded to :* "M. Eudolphi dis- 

 tingue les hydatides en vivantes et en non vivantes ; il regards 

 1'echinocoque proveriant des intestins des bisulques (Echi- 

 nococcus veterinorum) comme une hydatide vivante, par la 

 raison que Ton trouve dans le liquide qu'elle contient les ec- 

 hinocoques, proprement dits, c'est-a-dire, des petits corps mi- 

 croscopiques, pourvus de quatre su9oirs et d'une couronne de 

 crochets." The animal described by Mr. Wilson is also 

 referred to in the same abstract by Dr. Budd, " who examined 

 seven hydatid tumours which had been for many years in the 

 Museum of King's College," when he found appearances 

 exactly similar to those described by Mr. Wilson. It is more 

 than probable that the animals here alluded to by Dr. Budd 

 are similar to that I have called AcepJialocystis armatus, which, 

 if the case, from the want of suckers, cannot be an Echi- 

 nococcus, being merely a transitory stage of the acephalocyst. 

 For I have examined great numbers of these animals, pre- 

 served in the Museum of the Eoyal College of Surgeons in 

 Edinburgh a collection particularly rich in preparations of 

 these animals and in no instance have I been able to make 



* Traite Zoologique et Physiologique sur les Vers Intestinaux de I'Hmnme, 

 par M. Bremser. Traduit de I'Allemand par M. Grundler. Revu et augmente 

 de Notes par M. de Blainville. 



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