201 



Shell ovato-globose, the columellar side rather ventricose, entirely 

 of a snow-white colour. Base some^vhat flat. Aperture rather narrow, 

 curved posteriorly. Columellar groove extending from one end of 

 the shell to the other, rather broad, most so at the anterior extremity, 

 not deep. Teeth even, someuhat numerous, smaU on the edge of 

 the lip, onwhich there are about twenty-two ; onthe columella ahout 

 thirteen, \vhich converge tovrards the centre. Ribs rather prominent ; 

 some few terminate on either side of the shell, the ręst pass continu- 

 ously across it from the edge of the lip, and terminate in minute den- 

 ticulations at the inner border of the frontai groove : falše ribs a 

 few. Anterior and posterior beaks of the columella divergent, and 

 slightly projecting : extremities produced, and obtuse : marked den- 

 ticulations between the anterior beaks. Spire scarcely \isible, or 

 forming a small blunt protuberance. No impressed dorsal line. 

 Margiu on the lip only and rather thiek. 



Length •312 of an inch; breadth -250; height 212. 



Habitąt. Mexico. 



Distinguishable from Cijpr. scabriuscula by the shell being much 

 ■wider and shorter ; aperture more curved ; teeth and ribs much fewer ; 

 the extremities more obtusely produced, thicker and wider ; colu- 

 mellar beaks more divergent and prominent ; body of the shell more 

 ventricose ; anterior part of the columellar groove not so broad ; no 

 impression of a dorsal line. 



Cab. Gaskoin. 



The propriety of regarding this as a distinct species is confirmed 

 from the coincidence of three persons having done so, without any 

 communication or knowledge of each other, in three distant capitals, 

 viz., Dr. Beck of Copenhagen, by the name of Cypr. approximans ; 

 M. Duclos at Paris, by that of Cypr. olorina ; and myself in London, 

 iinder the appellation of Cypr. candidula : and as I believe I am the 

 first to describe it, it is perhaps right that I should retain, Eind apply 

 to it, my o\vn designation. 



Ctpk^a acutidentata. Cypr. testd candidd, ovato-globulosd, 

 uirinque subproductd ; labro incrassato ; costis acutis prominenti- 

 bus, dorsum versus partim interruptis, opacis, interstitiis in<squa- 

 libus nitidulis ; columelld convexiusculd, abscue plicd. 



Shell ovato-globular, white ; extremities slightly produced. Aper- 

 ture narrow, somewhat ventricose at the middle of the columella, 

 and a little concave at the anterior end. Teeth numerous, about 

 seventeen, thin, sharp, and prominent, continued to form the ribs, 

 Severai of ■vs'hich terminate (especially at the outer part of the shell) 

 before arriving at the summit of the back, and the teeth are conse- 

 quently more numerous on the lip than on the columella ; a deep 

 depression at each end of the columellar side of the aperture caused 

 by the abrupt termination of the columella, it not extending to the 

 extreme ends of the aperture. Ribs rather thick, not crowded, 

 prominent, the interstices between them somewhat shining ; observed 

 by a magnifier the ribs appear unevąn ; falše ribs at both extremities, 

 a few only forming teeth. No complete dorsal line, but a faint de- 



