24 



Semipellucid Cowry. — Shell ovate, of a beautiful semipellucid 

 Avhite colour, shining; the ribs — anterior, posterior and dorsal — ter- 

 minate in teeth on both sides and ends of the aperture, and traverse 

 the columellar groove to its inner edge ; a few ribs do not continue 

 over the dorsum ; the teeth, even, fine, and numerous, about thirty 

 on the lip ; columellar groove, deep and broad ; base round ; margins 

 wide ; no dorsal impression ; extremitles much produced, and obtuse ; 

 aperture straight, except a slight curve at its posterior extremity. 

 Size y^o^o^ths of au inch. 



Hab. South Pacific. 



Cab. Gaskoin, &c. 



DifFers from exigua of Gray, the tremeza of Duclos, in being less 

 gibbous, ribs more numerous, finer, more even and regular, and but 

 two or three terminate on the sides of the shell, none on the dorsum ; 

 they pass continuously over the shell from one side of the aperture 

 to the other ; shell perfectly colourless, and has no dorsal line or 

 impression. 



Cypr^a Pisum. Cyp. testd spheroidali, pallescente ; costellis pro- 



minentibus, ex aperturd ad lineam dorsalem decurrentibus, et in 



lineatn attenuatam terminantibus ; dentibus prominentibus ; sulco 



columellari lato ; aperturd latiusculd postice fleiuosd ; basi roturi' 



datd ; margine externo incrassato, supra extremitates extenso ; 



extremitatibus crassis ; lined dorsali profundd, ex extremitatibus 



posticis ad anticam testee partem continud. 



Pea Cowry. — Shell spheroidal, of a very light fawn colour ; ribs 



large and prominent ; nearly every rib extends from the aperture and 



terminates generally, tapering to a point, at the dorsal depression ; 



mostly the terminations on one side pass between those of the other, 



especiaUy on the anterior half of the shell ; each third or fourth rib, 



amounting to about seven, ends on the lip at the base of the shell ; all 



the other ribs on both sides form, by continuance, the teeth, which 



are strong and prominent; about tvventy-three on the columellar 



side of the aperture, •nhich extend across the columellar groove and 



serrate its inner edge ; those on the outer side or lip about twenty- 



one in number ; columellar groove broad and deep ; aperture rather 



"wide, curved, particularly at the posterior portion ; base round ; 



margin on the outer side very thick, extending over the beaks ; none 



on the columellar side ; extremities or beaks obtuse, thick, and 



slightly produced ; dorsal depression deep, extending from between 



the posterior extremities to the anterior end of the shell, being more 



deeply impressed beside the apex. 



Long. ^^ths of an inch. 



Hab. East Indies. 



Specimen unicum. Cab. Gaskoin. 



The characters of this shell are so distinctive that it bears no re- 

 lation to any yet described Cypraa ; it is nearest in form to Cyprcea 

 formosa of Gaskoin. 



Cypr^a Pulla. Cypr. tcstd ovatd, nitidd, /usco-rubexcente, cos- 

 tellis dentibusque concoloribus ,• costellis usque ad lineam dorsalem 



