MOLLUSCOUS ANIMALS. 
133 
In a young specimen, the mouth of which was not formed, the mantle on the pillar side was dilated, with 
a lobe covered with processes, and the outer side was simple with a slightly thickened edge. 
CyprzEA spurca. Var. t. 34./. 6, 7. 
This shell sometimes instead of having the usual mouth has a wide irregular scarcely toothed one, and the 
base and lips are purple brown, while in the common state they are yellowish. I have seen some shells in an 
intermediate state, and therefore have no doubt of its being a variety of this species. When I first described 
it, I thought it might be a variety of C. erosa with the lateral spot suffused over the base, but this does not 
prove to be the case. 
CYPRrEA annulus. 
The lobes of the mantle are covered with numerous papillee. 
OVULA. 
OVULA TUBERCULOSA. — Lam. 
The animal like the Cowry ; the tentacles rather blunt; mantle edges reflexed, smooth, with small oval 
brown dots. Foot large, crumpled on the sides, pale brown, black dotted; the penis large, low down. 
ERATO. 
The adult animal, like the Cowries, when alive extends a thin, membraneous, beautifully speckled mantle 
over the shell — the mantle is not extended in the young state. 
Most conchologists have confounded it with Marginalia, •, though Montagu, who was one of the first 
describers of the shell, refers it to its most natural situation amongst the Linnaean genera. 
CORIOCELLA. 
Co RIOCELL A NIGRA. — Blain. 
Sigaretus. — Cuv. Ann. Mus. Anat. 
Grows to a large size. The shells are the large Sigaret of English Cabinets ; they are green when 
fresh and soon become white ; the foot is not one-fourth the size of the mantle ; the penis is large, on the right 
side ; the trunk is long, like that of Buccinum. The tentacles depressed, close together, united on the inner 
side over the top of the hole of the trunk, with the eyes near the extremities; the penis is very long, subulate, 
acute ; operculum none. The canal of the mantle is very distinct, and lined with a cartilaginous skin. 
Lamarck referred the description and anatomy of this animal to his genus Sigaretus, and thus his cha- 
racter consists of the animal of this and the shell of that genus, 
VO LUTA. 
Mantle small, thin, not extended beyond the margin of the shell, with a rather short thick open respiratory 
canal, furnished with a subulate ear-like lobe or process on each side of its base. The tentacles short, conical, 
far apart, with the eyes on their outer base, and behind them is placed along the side of the head a semicircular 
lobe. The trunk rather thick, conical ; the foot large, folded longitudinally when contracted ; the male organ 
is large with a conical reflected tip ; operculum none. 
The respiratory canal of this genus with its two lobes at its base may easily be mistaken for a trunk with 
its two tentacles. In some species the tentacles are placed on a semilunar hood from under which the trunk 
arises; and the eyes are sometimes rather behind the base of the tentacles, and the tentacles are sometimes 
nearer the margin than at others. 
