CASSIDID.®. 199 
Ovuuum, Brug. 
Syn.—Amphiperas, Gronoy. Simnia, Risso. 
Distr —75 sp. Tropicaland subtropical. Fossil. Tertiary—. 
O. pyriformis, Sowb. (1xi, 12, 13). 
Shell ventricose, convolute, attenuated and subacuminated at 
both ends; outer lip of adult thickened and inflected. 
These shells are not ornamented with the rich and varied 
colors of the cowries, having but little pattern-painting ; they are 
at once distinguished from them by the attenuated and frequently 
produced ends. 
Simnia was proposed for a few species, with sharp aperture- 
margin, which have proved to be the young of typical Ovule. 
CALPURNUS, Montf. (Cyprella,Swains.) Cypreiform, gibbous, 
with a small tubercle at each extremity. O. verrucosum, Linn. 
(Ixi, 14, 15). 
cYPHOMA, Bolten. (Carinea, Swains.) Shell with a transverse 
dorsal rib; inner lip smooth, outer lip very slightly crenulated. 
C. gibbosum, Linn. (1xi, 16, 17). 
voLtvA, Bolten. (Birostra, Swains. Radius, Montf.) Shell 
ventricose in the middle, both extremities prolonged into canals ; 
lips both without teeth. Animal, mantle-margin with glandular 
tubercles, foot narrow, folded lengthwise on itself, adapted for 
creeping on the narrow, rounded branches of gorgoniz and corals 
—on which it is supposed to feed. C. volva, Linn. (1xi, 18). 
CRITHE, Gould. Shell ovate with produced extremities, and a 
delicate groove at the summit; aperture narrow, outer lip 
unarmed; base of the shell with about eight coarse lamine, 
passing into the aperture, and having the appearance of denta- 
tions on the inner lip. O. atomaria, Gld. China Seas. 
PEDICULARIA, Swainson. 
Syn.—Thyreus, Phil. 
Distr.—9 recent sp. Europe, Polynesia. 1 Miocenesp. Eur. 
P. Sicula, Swains. (xi, 19, 20). 
Shell small, limpet-like, irregular, with small, short spire, con- 
cealed with the growth, and a radiately ribbed surface when 
young; mouth large, lips simple, irregular. Animal with eyes 
sessile at the outer bases of the tentacles, mantle enclosed, not 
produced into a siphon in front, foot small. Operculum none. 
DENTIORA, Pease. Columella plane or excavated, compressed 
and dentate within. D. rubida, Pease. Sandwich Is. 
Famity CASSIDIDA. 
Shell solid, subglobular or triangular; spire short, whorls 
sometimes varicose ; aperture terminating anteriorly in a shortly 
recurved canal, columella callous, usually plicated, outer lip 
ribbed, dentate within. 
