PROSOBRANCHIATA. 165 
in the French specimens of V. spinosa, with which species the present one is 
closely analogous, and of which it appears to me to be merely a local variety. It is 
in fact, only distinguished by the more ventricose whorls, the more effuse aperture, the 
rounded columella, and the greater obliquity of the columellar folds. 
Brander’s shell (fig. 67), referred by Mr. Sowerby to this species, belongs to 
V. luctatria ; and the French shells which M. Deshayes has described as V. depauperata 
also appear to be quite distinct; they are longer, narrower, and more regular in form, 
and have a more elevated and thicker spire ; and the surface of the whorl is obscurely 
striated. 
Size.—Axis, 1 inch and 9-10ths; diameter, not quite 1 inch. 
Localities.—Barton (fig. 8 a), and the fluvio-marine formation at Hordwell, and at 
Colwell Bay (figs. 8 4, c), in which latter place it occurs in abundance. 
No. 103. VoLUTA GEMINATA. Sowerby. Tab. XXI, figs. 3 a, 6. 
VotuTa GEMINATA, Sow. 1823. Min. Con., vol. iv. p. 136; t. 398, fig. 1. 
V. testé ovatd, ventricosd, antice coarctatd, costatd, sub-turritd ; spird mediocriter 
elevatd, apice acuto ; anfractibus postice levibus, ad basin transversim sulcatis, ad margines 
suturales depressis ; costis pro-eminentibus, sub-crassis, postice bind serie spinarum nodifor- 
mium coronatis; aperturd oblongo-ovali, antice angustiori ; labro tenero, simplict ; labro 
late expanso, postice incrassato ; columella arcuatd, tri-plicatd. 
Shell ovate, ventricose, contracted towards the base, ribbed; spire moderately 
elevated, apex very small, pointed ; whorls five or six, smooth on the middle and at the 
posterior extremities, transversely furrowed toward the base, and flattened at the sutural 
margin ; ribs prominent, rather thick, rounded, extending to the transverse furrows, and 
surmounted by two rows of short, erect, connected, nodiform spines, with a rounded, 
depression between them; the flattened margins of the whorls form a shallow obscure 
channel round the spire, imparting to it a turret-like aspect. The aperture is of a 
lengthened-oval shape, narrowing toward the base; the outer lip thin, sharp, and 
smooth within; the columellar lip much spread out over the body-whorl, but not 
extending backwards beyond the suture; the columella much curved, and furnished 
with three oblique folds. 
The present species appears to be confined to the neighbourhood of Lyndhurst, 
where it was first discovered many years ago by Sir Charles Lyell. 
Size-—Axis, rather more than 1 inch and 3-l0ths; diameter, 7-l0ths of an 
inch, nearly. 
