THE CVtJTIC KNTOZOA. 4b7 



IV. — OF Sl'HAlKimuN.*— (I'LATIC VI., FlO. l*"..) 



Spluii rid lull avtyhalucuslU !.•> iin iiniuuil ullied to Acuphulo- 

 cystis, chielly from its acephiilic cbanictor, but also lioiii its 

 n'pruductive urguti being enclosed witbiu tbe centre of its sac. 

 This reproductive body or membrane is exactly similar to 

 the pedicle of the Cysticercus, with the exception of its being 

 entirely buried in the body of the animal, consequently also 

 it is neither furnished with teeth nor suckei"s. There is no 

 separate absorbent apparatus in the sac of the animal, and 

 this part of its body appears to be composed of one membrane 

 only, which is analogous to the external membrane of the 

 sac of Acephalocystis. Tiie cyst of this animal at first 

 appears to be composed of three membranes, but a little 

 examination proves the outermost to consist of peritoneum 

 only, the two others being similar to the analogous membranes 

 of the cyst of Cysticercus rattus, namely, an external for 

 defence, and an internal for absorption of nourishment. 



This animal was found attached to the intestines of the 

 Balearic Crested Crane {Balcarica jjaconia, Vigors) beneath 

 the peritoneum. 



V. — OF ciENURUS.t- -(Plates VI., XII.) 



The next animal we have to describe is Cienurus. It is 

 in the species belonging to tiiis genus that the firet vestiges 

 of extremities are perceived, to which form of structure we 

 are led througli Diskostoma — the discs described in the latter 

 being without doubt analogous to the pedicles of the 

 Cienurus. 



Ccenurus ccrchralis, an animal frequently found in the 

 brain of the sheep and other ruminants, has been long known 



* '^<paiplttov, II globule. 



t Transtictiuiis o/lhe Jioi/al SocU/y, Kiliuburgli, vol. xv. p. 56-1. 



