278 Rev. Mr. Berkeley on the 



always remain doubtful, perhaps it would have been as well if Say had 

 not adopted the trivial name of Pilar ides for the Mohuy of Oviedo. 



Believe me, ever yours, 

 W. S. MagLeay. 



P. S. By the bye, how is it that none of your naturalists have ob- 

 served that the new genus of MoUusca, described and figured in the 

 eighth number of your Zoological Journal, under the name of Peripatus 

 JuliformiSf is an annulose animal, connecting the Julidce with the Worms 

 among the Ametahola ? There is a specimen in my father's collection. 

 I have been waiting to allow Mr. Guilding, or some other person, to cor- 

 rect this error, but as no person has yet done it, perhaps this notice may 

 be acceptable. I leave Mr. Guilding to follow up the hint, and give us 

 an accurate microscopical dissection of this interesting animal. 



Art. XXXIV. A Description of the Anatomical structure 

 of Cyclostoma elegans. By the Rev, M. G. Berkeley, 

 M.A., Christ's College, Cambridge. 



The genus Cyclostoma differs so widely from other Pulmonifera, 

 (from those at least whose animals have been described,*) in having the 

 sexes distinct, in distinct individuals, that a knowledge of the internal 

 structure of the animal appears very desirable. I am not aware that any 

 detailed account has hitherto been published, and am therefore willing, 

 though ill qualified for such a task, to offer the result of my own obser- 

 vations. Cuvier seems to have considered the anomaly of its structure in 

 the particular point above stated, as sufficient to exclude it from the Pul- 

 monifera, and has arranged it amongst his Pectinibranchia, though no 

 pectinated branchiae exist. 



* Possibly, such land-shells as have been arranged under the genus Auricula, 

 e. g. Carychium minimum, Acme lineata, &c., may also have the sexes dis- 

 tinct. 



