162 EOCENE MOLLUSCA. 
No. 100. VoxtutTa penupata. Sowerby. Tab. XXI, figs. 5 a—e. 
VoLUTA DENUDATA. Sow. 1840. Min. Con., vol. 7, p. 6; t. 93, fig. 3. 
— —_— — 1850. Dixon’s Geol. Suss., p. 120; t. 15, fig. 7. 
V. testa ovato-oblongd, postice levi, antice transversim sulcatd, profunde emarginata ; 
spird conicd, brevi, apice acuto ; costis brevibus, crassis, ad extremitates posteriores nodi- 
geris ; antractu ultimo superne concamerato : aperturd elongato-ovali, postice angusta ; labro 
simplici, intis levi ; labio expanso, incrassato ; columella tri-plicatd. 
Shell oblong-ovate, ribbed, smooth, except towards the base, where it is transversely 
furrowed; spire short, conical ; apex small, pointed; ribs thick, short, scarcely extend- 
ing to the middle of the whorl, and terminating posteriorly in coarse, nodiform tubercles; 
whorls rather ventricose in front, obtusely angulated at the shoulders; the space 
between the tubercles and the suture convex, imparting a dome-like shape to the lower 
part of the spire. The aperture is of a lengthened oval form, narrow, obscurely chan- 
nelled behind, widely and deeply notched in front ; the outer lip simple, smooth within ; 
inner lip much spread over the front of the body whorl, extending backwards far up 
the spire, and thickened. The columella is flattened in front, and presents one thick, 
prominent fold in front, and two or three smaller ones behind. In the young shell, the 
whorls are crowned with three rows of small, nodiform spines, and the margins between 
the front row and the suture are somewhat depressed. The two posterior rows, which 
correspond with the front row, rise out of faint, elevated lines, which traverse the sutural 
margin; as the shell is enlarged, these spines are lost, and the transverse lines become 
stronger ; the direction of the suture also becomes less decurrent, so that each succeeding 
whorl envelops more of the preceding one, and the margin of the last, in fact, covers the 
front row of spines upon the whorl next to it; the margins also become convex, and 
assume the dome-like shape characteristic of the later whorls. 
Size.—Axis, 3 inches, nearly ; diameter, 1 and 7-10ths of an inch, nearly. 
Localities—Bognor, where it is very common, and (fide Sow.) Brentford. 
No. 101. Vouura sprnosa. Linneus. Tab. XXI, figs. 4 a, 0. 
Lister. Hist. Conchyl., t. 1033, fig. 7? 
Gualtieri. 1742. Index Test. Conch., t. 55, fig. E? 
Conus sprnosus. Linn. 1758. Syst. Nat., 10th edit., p. 715, No. 271. 
Buccinum (sp.) Walch. 1764. Das Steinreich System., &c., t. 11, fig. 2 a. 
SrrompBus sprnosus. Linn. 1767. Syst. Nat., 12th edit., p. 1212. 
— —_ Favanne. 1780. D’Argen. Conchyl., 3d edit., t. 66, fig. I, 9. 
— — Schréter. 1783. Hinleit. in die Conch., vol. 1, p. 443, No. 24. 
—_ — Gmel. 1788. Linn. Syst. Nat., 13th edit., p. 3518, No. 27. 
