PROSOBRANCHIATA. 163 
STROMBUs sPINOsUS. Chemn. 1795. Conchyl. cab., vol. xi, t. 212, figs. 3002—3. 
VoLuTa spinosa. Lam. 1802. Ann. du Mus., vol. i, p. 477, No. 2, and vol. xvii, p. 74, 
No. 2. 
—_ — Roissy. 1804. Buff. Moll., vol. v, p. 440, No. 7. 
— — Lam. 1816. Tableau Encyclop. et Méth., t. 392, fig. 5 a—d. 
— —_— — 1822. Hist. Nat., vol. vii, p. 348, No. 2. 
— De France. 1829. Dict. des Sci. Nat., vol. lviii, p. 474. 
— — Desh. 1832. Encycl. Méthod. (Vers), vol. iii, p. 1143, No. 22. 
— — — 1824—37. Dese. des Coq. Foss., vol. ii, p. 690; t. 92, figs. 7—8. 
— — ? Galeotti. 1837. Mém. sur la Const. Géog., &e., de Brabant, p. 149, 
No. 71, t. iii, fig. 16. 
a — ?Nyst. 1843. Coq., &., de Belg., p. 589. 
— — Morris. 1843. Cat. Brit. Foss., p. 168. 
— — 1? Philippi. 1851. Paleontogr. Tert. Foss. Magdeb., p. 78, No. 169. 
Nec. — — Sow. 1816. Min. Con., vol. ii, p. 30; t. 115, figs. 2—4. 
nec. — os — 1850. Dixon’s Geol., &c., of Suss., p. 107; t. 5, fig. 16. 
nec. — — var. Pratyspina. Sow. 1850. Dixon’s Geol., &c., of Suss., p. 107; t. 5, 
fig. 29. 
V. testa turbinata, ad basin transversim striata, longitudinaliter partim costatd ; anfrac- 
tibus acute angulatis, unicd serie spinarum coronatis ; spird brevi, apice acuto ; labro tenui, 
simplict ; columella quadri-plicatd. 
Shell turbinate, resembling in shape two unequal cones placed base to base, the 
smaller of which is formed by the short pointed spire; whorls nearly straight, longitu- 
dinally ribbed, much narrowed in front, and acutely angulated at the shoulder; the 
margin between the spines and the suture rather concave. The ribs, which extend 
only about half-way over the whorl, terminate at the shoulder in a row of short, 
pointed spines. The sutural margin is bordered by an elevated line, which, occa- 
sionally, in young shells, rises into small, pointed tubercles opposite to the spines. The 
whorls at the base are traversed by several oblique furrows, which disappear towards 
the middle of the shell, where the ribs take their rise. The mouth is narrow, and 
somewhat quadrilateral, owing to the angularity of the upper part of the whorl; the 
outer lip thin and smooth within; inner lip but little spread out. The columella, 
which is rather flattened in front and nearly straight, presents one large prominent 
plait in front, and three, sometimes four, feeble ones behind and, according to 
M. Deshayes, a large smooth callus at the posterior extremity formed by the thickening 
of the inner lip. 
The shells from Barton, described by Mr. Sowerby (loc. cit.), and referred by him 
to this species, present characters sufficiently distinct, as I have before observed, to 
require that they should be separated. I have not met, in fact, with any shell from the 
Hampshire beds corresponding with the true /. spinosa of the Paris basin, unless the 
V. depauperata be regarded as a local variety; but the species occurs not unfrequently 
at Bracklesham Bay. 
