270 CALyPTR.EIDiE. 



Oenus L.EPETA, Gray. 1840. 



Shell obovate, depressly conical, surface with radiating strice ; 

 apex eccentric, posterior ; aperture oval, muscular impression horse- 

 shoe-sliaped, open anteriorly. Animal Ijlind. 



Lepeta caeca. 



Shell small, white, with numerous diverging ribs, checked by revolving lines, 

 apex central. 



Lepda cceca {Patella), Muller, &c. ; Stimpson, Check Lists, 4. 



Patella Candida, Couthouy, Sillim. Journ. o. s. xxxiv. 217 (18.38); Bost. Journ. Nat. 



Hist. ii. 86, pi. 3, fig. 17.— Gould, Inv. 1st ed. 152. -De Kay, N. Y. Moll. 61. 

 PUidiuiacundidum, Stimpson, Shells of New England, 29. 



Shell small, conical, white, oval, having numerous minute radi- 

 ating ribs, traversed by equally fine concentric lines, which give the 

 surface, when viewed under a magnifier, the appearance of 

 ^'^j^^^' network ; summit nearly central, margin slightly scalloped 

 by the termination of the ribs ; interior white. Length, 

 seven twentieths of an inch ; height, one tenth of an inch ; 

 breadth, one fifth of an inch. 

 Only three specimens of this shell are yet known. The 

 first one found was taken by Mr. Couthouy from the stomach of a 

 fish canght off Banistal)le, and was described by him. A second 

 has since been found by Mr. W. W. Whieldon, of Charlestown. It 

 is at once distinguished by its checkered or granulated surface, no 

 other species, yet described, having that character. 

 Greenland {Moller}. 



Family CALYPTR^ID.^, Brod. 



Shell basin-shaped, serving as a cover to the animal; distin- 

 guished from the preceding family by the branchias being situated 

 in a peculiar cavity upon the back. 



Oenus CREPIDULA, Lam. 1799. 



Shell oval, arched, somewhat boat-shaped, with an imperfect 

 spire pressed against the margin ; cavity partially divided witlnn by 

 a horizontal partition. 



