84 THE ANATOMY AND DEVELOPEMENT. 



Pechinocoque provenant des intestins des bisulques (Ec/tinococcus 

 veterinorum) comine une hydatide vivante, par la raison que Ton 

 trouve dans le liquide qu'elle contient les echinocoques, propre- 

 ment dits, c'est-a-dire, des petits corps microscopiques, pourvus 

 de quatre sucoirs 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 tumors 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 Acephalocystis 

 armatus, which, if the case, from the want of suckers, cannot be 

 an Echinococcus, being merely a transitory stage of the ace- 

 phalocyst. For I have examined great numbers of these animals, 

 preserved in the Museum of the Koyal College of Surgeons in 

 Edinburgh a Collection particularly rich in preparations of 

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

 the slightest vestige of suckers. I had made out the existence 

 of teeth, and was anxious to determine whether or not the 

 animal was allied to the cephaloid hydatids. 



The next form of Acephalocystis is one presenting a structure 

 peculiar to itself, and which at once distinguishes it from the 

 others. The external membrane is gelatinous and delicate ; the 

 germinal one is more fibrous, and is so slightly attached to the 

 external one, as to float in the contained fluid. When a small 

 portion of this germinal membrane is placed under the micro- 

 scope, its free or internal surface presents the following appear- 

 ances : 1st, A fibrous texture forming the basis of the membrane ; 

 2d, A series of large irregular ovoid vesicles, arranged in irre- 

 gular rows. The fibrous texture surrounds the vesicles, and thus 

 presents a peculiar appearance of ramification of a very regular 

 form. Each of the vesicles contains one or more dark spots con- 

 taining nucleoli these spots are the young hydatids.* 



* This species I have named Aceplialocyslis Mom'oii, after Dr Monro, to whom I am in 

 clcbted for the opportunity of examining the species, and from whom also I have received 

 much^valuable information regarding hydatids generally. A very beautiful figure of A 

 Monroii is given in Dr. Monro's work on " The. Morbid Anatomy of the Stomach and Gullet,'" 



