PROSOBRANCHIATA. 1 69 



columella., and the basal furrows are fainter ana "more numerous, becoming, in fact, 

 almost obsolete on the mature shell. 



The present species certainly presents a close analogy with ?* labrella (Lamk.) to 

 which the adult shells have been referred ; but a careful comparison will show, I think, 

 that they are not a mere local variety of that species, but distinct from it. In V. 

 Selseiensis, the whorl is more convex, and the general form of the shell is consequently 

 more ovate and less turbinate ; the shoulder is always obtusely rounded, and never pre- 

 sents the prominent keel which characterises V. labrella, nor even the angular periphery 

 which, in some specimens, is substituted for the keel ; the transverse furrows are lost 

 after the very early whorls, while in the French species they are continued more or 

 less distinctly until maturity. But the principal differences will be found in the con- 

 dition of the lips ; for in V. labrella, the outer lip is much less thickened, and does not 

 assume the wing-like expansion found in the present species ; the inner lip is more 

 widely spread over the front of the body-whorl and, although thickened at the pos- 

 terior extremity, does not form the large callus which, by separating the margin of the 

 whorl from the spire, forms so conspicuous a character in V. Selseiensis. 



Si%e. — Axis, 2 inches and 7-lOths nearly; diameter, rather more than 1 inch and 

 6-10.ths. 



Locality. — Bracklesham Bay, where it is not uncommon. 



Section A. {Pullus small, conical) continued. 



b. Shell fusiform ; costated, transversely striated ; inner 

 lip narrow. 



a. Columella? plaits few. 



No. 108. Voluta angusta. Deshayes. Tab. XXIII, figs. 3 a, b. 



Voluta angusta, Desh. 1824-37. Desc. des Coq. Foss., vol. ii, p. 697; t. 94, figs. 5, 6. 

 — — Sow. 1844. Min. Con., vol. vii, p. 34, t. 626, figs. 1—3. 



_ _ Sow. 1850. Dixon's Geol., &c, of Suss., p. 107, t. 5, fig. 19 (non t. 7, fig. 37). 



V. testa elongatd, sub-fusiformi, angusta, costatd, ad basin late emarginatd ; spirdpro- 

 ductd sub-conicd, apice acuto : anfractibus depresso-convexiusculis, superne tenuissime striatis ; 

 ultimo anfractu spiram longitudine fere cequanti ; postice tuberculoso-costatd, ad basin lavi : 

 aperturd elongatd, angusta; columella recta, obscure triplicatd ; labro acuto, simplici ; 

 labio angusto. 



Shell fusiform, much elongated, narrow, ribbed, and widely but not very deeply 

 notched at the base ; spire conical, produced, nearly as long as the last whorl ; apex small, 

 pointed : whorls depressedly convex; ornamented with exceedingly fine transverse 

 striae ; ribs distant, not prominent, extending to nearly the middle of the whorl, and 



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