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. luctatrix ; 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 b, c), in which latter place it occurs in abundance. 



No. 103. Voluta geminata. Sowerby. Tab. XXI, figs. 3 a, b. 



Voluta geminata, Sow. 1823. Min. Con., vol. iv. p. 136 ; t. 398, fig. I. 



V. testa ovatd, ventricosd, antice coarctatd, costatd, sub-turritd ; spird mediocriter 

 elevatd, apice acuto ; anfractibus postice Icevibus, ad basin transversim sulcatis. ad margines 

 saturates depressis ; costis pro-eminentibus, sub-crassis, postice bind serie spinarum nodifor- 

 mium coronatis ; aperturd oblongo-ovali, antice angusiiori ; labro tenero, simplici ; 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 3-10ths ; diameter, 7-10ths of an 

 inch, nearly. 



