CALIENDRUM. TRACHELIPODA. 35 
in an obtuse apex; aperture longitudinal, elongated, some- 
what contracted above and below, with a very short canal 
at its base; outer lip thickened, numerously toothed on its 
inner edge, broadly reflected on the columella, and furnished 
with granulations ; supposed to have an operculum. 
Oniscia cithara. Plate X. fig. 6. Found fossil at 
Belforte, Italy. 
The Oniscize inhabit the ocean. There are but few species in the genus, 
and these are tropical. 
Genus XXI.— CASSIDARIA.— Lamarck. 
Generic Character. — Shell subovate, ovate, or oblong ; 
ventricose ; body very large; spire short; aperture longi- 
tudinal, narrow, terminating at the base in a recurved 
canal, which points upwards, when the shell is held with 
the aperture downwards; outer lip marginate, thickened, 
reflected, frequently dentated within; inner lip expanded, 
covering the lower portion of the body and columella, but 
detached from it at the base, immediately above the canal, 
which, in some species is rough, granular, tuberculate, or 
rugose ; outer surface generally grooved, tuberculated, and 
covered with a thin, horny epidermis. Supposed to have 
an operculum. 
Cassidaria carinata. Plate ILI. fig. 39, Found fossil 
in the London clay at Highgate Hill. Fossils of this 
genus are, however, very rare, and are met with only in 
the tertiary deposits, such as the Calcaire-grossiér of the 
Paris basin and Piacenza. 
The chief difference between the shells of this genus and those of Cassis, 
consists in the beak being more abruptly curved than in the latter genus. 
The Cassidariz inhabit the oceans of the tropics, and the species are very 
limited in number. 
SUB-DIVISION II.— Shells destitute of a regular canal. 
Genus XXII.— CALIENDRUM. — Brown. 
Generic Character.—Shell oblong-ovate, acute; volutions 
deeply divided ; aperture irregularly ovate, oblique, rounded 
above and contracted beneath ; columella greatly reflected 
and undulous, destitute of a canal at the base; outer lip 
very broad, somewhat reflected, and smooth on the margin. 
Caliendrum vittatum. Plate %. fig. 7. Found in the 
Mountain Limestone at Bolland. 
Known only in a fossil state. Buccinum vittatum, Phillip’s Geology af 
Yorkshire, ii. plate 16, fig, 14- 
