422 
THE OCEAN WORLD. 
Porcelain, already figured with its inhabitant. This shell (I'ig. Ml-) 
is large, oval, tun-bellied, thick, and convex, of a bluish white, orna- 
mented with numerous broad, black, round spots, much scattered, and 
a straight dorsal line, brown above and very white below. It has gene- 
rally twenty-three teeth on each edge, quite white. Somewhat resem- 
bling the Tiger Porcelain is the Cypriea pantherina (Pig- 252), Miic i 
is probably a variety of the same species. Another remarkable species 
is Cijpnm argus, as represented in Pl. XXII. (Figs. VIII. and IX.) 
Fig. 253. Natural size of Ovula oviformls (Linnaeus). 
The genus Ovula, so called from their egg-shaped form, occupy® 
place near the cones in the system. The shell is highly polished, white 
or rose coloured, oblong or oval, convex, attenuate, aim 
M, acuminate at the extremities without apparent spiral, the 
\( In edges milled within the long, narrow, and curved opening* 
\llfl ' v ‘th l e<:t h upon the left edge, and with a few ripples on 
[ ISM fl the right edge. The Ovula; are inhabitants of the Indian 
Ocean and Chinese seas. Some few species, howeveD 
Fi ^ 25 hnlfr l belong to the Mediterranean and the Black Sea. 1 ie 
cornea (Lamk). species represented in Figs. 253, 2o4, and zoo, p 
sent very singular contrasts of form and size. 
In the genus Voluta, from volvere , to turn, the shell is oval, mo^ 
or less tun-bellied. A spiral rising, slightly mammelate, the opening 
large, the edges notched, without channel; the columellar edge 
lightly excavated and arranged in oblique folds. The right edge i 
arched, thick, or cutting, according to the species. 
