64 Gray on llditima. 



into a collar, which is not the case with Cyclostoma, and they 

 appear to form a family, intermediate between the Helkidce and 

 Turbinidaj ; it seems to be connected with Cyclostoma by means 

 of C.patulum; which has a rather semiorbicular mouth, and an 

 homy operculum apparently spiral. 



In consequence of Lamarck refering only to Lister's figure, 

 which has not been taken notice of by any preceding concholo- 

 gists, most of the English collectors, and even De Montfort, have 

 considered the Trochus Vestiarius, Lamarck's Rotella, as the 

 type of this genus. 



Say, the best of the American conchologists, was not aware of 

 its existence, and therefore formed a new one under the name of 

 Oligyra, for a shell that certainly belongs to this, although I 

 have not seen it. Dr. Leach appears to have been equally 

 ignorant of what Lamarck meant, as in his progress of Zoology, 

 published in Thomson's Annals of Philosophy, he does not ob- 

 serve that Say's and Lamarck's genera were synonymous : but 

 refers the latter to the family Auriculadeae, most likely accident- 

 ally; and De Ferrussac, who frequently quotes Say's work, 

 does not take any notice of the synomyn in his Tableau systema- 

 tise. 



Division. — It may be divided into five sections, which are 

 partly artificial ; but there are certainly many other species as yet 

 undescribed : — 



Peristomate edentulo. 

 ♦integro 

 **postice subaculeato. 

 ***postice emarginato v. fisso. 



Peristomate sinuato. 



****columella basi callosa. 



Peristomate dentato. 

 *****columella basi concava. 



Shell. Peristome reflected, toothless, entire, operculum not 

 append iced. 



1 . Helicina pulchella. 



Testa (subgloboso-conoidea) lutea, interrupte rufo-tri-fasciata, 

 supra cpnica, spiraliter albido-rugosa, infra convexa, spiraliter striata. 



