NEVERITA. 345 



the suture ; the region before the umbilicus, too, is very white ; um- 

 bilicus rounded and deep ; operculum horny. Lengtli, thirteen for- 

 tieths of an inch; breadth, nine fortieths of an inch. 



First found by Colonel Totten in Newport Harbor, and afterwards 

 in Provincetown Harbor. It is found plentifully in the stomachs of 

 fishes taken in Massachusetts Bay. Halifax, Banks ( Willis') ; East- 

 port {Cooper) ; whole coast of New England {Stimpson). 



I know of no species resembling this, except it be Natica Ang-Iica, 

 of which some specimens are said to be immaculate. But that shell 

 has a more elongated spire, a broader aperture and base, and its 

 greatest breadth is rather below instead of rather above the middle, 

 as in this species. It is the smallest species with which I am ac- 

 quainted, though I have seen one specimen two fifths of an inch in 

 length ; and, for so small a shell, it is remarkable for its solidity. 



Genus NEVERITA, Risso. 1826. 



Operculum simple, cartilaginous. 



Shell orbicular, depressed ; spire flattened ; aperture wide, semi- 

 lunar ; inner lip straight, callous ; columella adherent to, and spi- 

 rally contorted in, the umbilicus, the apex more or less dilated and 

 truncate. 



Neverita duplicata. 



Fig, 164. 



Shell conical-ovate, usually with a dark band above the suture on the upper 

 whorls ; umbilicus deeply grooved, and partially or entirely covered with a chest- 

 nut colored callus. 



Natica duplicata, S\Y, Journ. Aciid. Nat. Re. ii. 247. — Gould, Inv. 1st. ed. 236, fig. 164. 



-De Kay, N. Y. Moll. 121, pi. 7, fig. 147. — Philippi, Abbild. pi. 1, fig.\ not 



of Reeve {Lunatia heros). 

 Natica Recluzinna, Desk. Mag. Zool. 1841, pi. 37. — Reeve, Con. Icon. 

 Neverita diplicata, Stimpson, Check Lists, 5. 



Shell solid, ovate, the upper portion of the whorls compressed so 

 as to give it a pyramidal outline ; surface marked with very faint 

 revolving lines, and more conspicuous lines of growth ; color light 

 chestnut-brown above a line marking its greatest circumference, 

 whitish or ash colored beloAv it ; usually having a dark brown band 

 on the lower portion of the posterior whorls, and the upper portion 

 whitish ; whorls five or more, spire rather prominent ; aperture 

 ovate, very oblique ; outer lip very thin and sharp, joining the whorl 



