VERTIGO. 113 
VELUTINA. Lam. Fam. Macrostomata, Lam. Descr.Sub-globose, 
covered with a velvet epidermis; spire short, composed of two 
rapidly enlarged, ventricose whorls; aperture large, sub-ovate ; 
peritreme thin, entire, separated from the last whorl; columella 
tortuous, thin. Obs. This shell does not resemble any other 
genus in ‘the family, Fig. 337. 
VELATES. Montf. Neritina perversa, Lam. Fig. 326. 
VENERICARDIA. Lam. A genus composed of the more oblong 
species of Carpiva. 
VENERIRUPIS. (from Venus and rupis, rock.) ‘The oblong spe- 
cies of Venus, Auct. which live in cavities of rocks and stones, 
This genus is united by Sowerby with some other species of 
Venus, under the name Pullastra. V. Vulgaris, fig. 97. 
VENTRAL. (Venter, the belly.) The margin of a bivalve shell 
opposite the hinge. ‘The under valve in Brachiopoda. 
VENUS. (Goddess of the Sea and of Beauty.) Fam. Marine Con 
chacea, Lam. Conchacea, Bl. Descr. Equivalve, inequilateral, 
sub-globose, sub-ovate, transverse, externally rugose, striated, 
ribbed, cancellated or smooth, margins entire, simple, sage) 
hinge with three, more or less distinct cardinal teeth, diverging 
from the umbones in each valve; muscular impressions two, 
lateral, distant; paleal impression sinuated posteriorly ; ligament 
external. Obs. This extensive genus, including some bivalves 
of a splendour and beauty justifying the name given to it, may 
be known from Cytherzea by the absence of a lateral tooth, which 
is found near the cardinal teeth in the latter. Artemis is dis 
tinguished not only by its lenticular form, but by the deep angu- 
lar sinus in the palleal impression. Fig. 119, 119, a. 
VERMETUS. Adanson. Fam. Scalariana, Lam. Cricostomata, 
Bl. Descr. Spiral at the apex, irregularly twisted towards the 
aperture; aperture round, small. Obs. This shell resembles the 
Serpula in general appearance, although regularly spiral towards 
the apex. The animal, however, is known to be a true mollusc, 
rather nearly allied to Dentalium, which is not rightly placed 
in the Lamarckian system. Fig. 345. 
VERMICULARIA. Lam. Vermertus, Adanson, afterwards VER- 
mMETUuS, Lam. 
VERMILIA. Lam. A genus composed of species of Serpule, 
which are attached by the whole length of the shell, no part 
being free. V. triquetra, fig. 345. 
VERTEBRALINA. D’Orb. A genus of microscopic Foramini- 
fera. 
VERTEX. Apex. 
VERTIGO. Mull. Fam. Colimacea, Lam. Cylindrically fusiform. 
sinistral hyaline; aperture marginated, sinuated, denticulated 
on the inner edge; peristomesub-reflected. Obs. This genus of 
minute land shells, resembles Pupa, but is a sinistral, hyaline 
shell. V. pusilla, 293. Aare) 
