314 EOCENE MOLLUSCA. 
shoulders a series of slightly curved, irregular crenulations, more or less closely set in 
different specimens; the posterior margins are very wide, covering the preceding 
whorls up to the shoulders ; they are deeply channelled, and much thickened round 
the sutural edge, so as to form a broad, elevated band, which is crossed by numerous 
narrow, vertical plications, corresponding with the crenulations on the shoulders ; the 
whole surface of the margins, and also the shoulders, are covered with fine, concentric, 
raised lines, which are most prominent over the sutural band; the body whorl is flatly 
convex, nearly conical, and terminates in front in a wide, short, but distinct canal, 
rather deeply notched at the anterior extremity. The concentric bands are thick and 
very prominent, rounded on the upper surface, and rather distant; the intervening 
spaces are flat, and traversed, in some specimens, by one or more thread-like raised 
lines, and in others by flattened bands, similar in character to the principal bands, but 
much narrower and less prominent. The aperture is of an oblong-oval form; the 
outer lip much arched, almost semicircular, thin and sharp on the edge, and smooth 
within ; the sinus, which is placed on the shoulder, is deep and not very wide, with 
nearly parallel margins ; and the columella is slightly twisted, and presents near the 
middle an obscure callus. 
This strongly marked species is, I believe, peculiar to Bramshaw ; at least I have 
not met with it elsewhere. In its general aspect and the character of the ornamenta- 
tion, it strongly resembles the Soissonnais shells referred by Deshayes to Solander’s 
P. colon; but, as I have already pointed out, the sinus in those shells is placed in the 
marginal furrow, and not on the shoulder, as in the present species. 
Size.—Axis, rather more than 13 inch ;.diameter, 7-12ths of an inch. 
No. 239. Preuvroroma nemiLeia.” F. #. Bdwards. Tab. XXXII, fig. 13, a, d. 
P. testa fusiformi, utrinque sub-conicd, transversim fasciolatd : anfractibus ad humeros 
obtuse angulatis, in juventd plicatis, deinde levibus ; antice planulatis, postice declivis, paulo 
concavis, ad suturam concentrice lineatis ; caterum levibus; fasciolis transversis sub-distan- 
tibus, parum elevatis, interstitiis concavis ; ultimo anfractu ad basin emarginato : apertura 
angusta, sub-quadratd, in canali patulo, indistincto, exeunte ; labroleviter arcuato ; sinu ad 
humerum collocato, lato, profundo, marginvbus sub-parallelis ; columella leviter contortd. 
Shell fusiform, rather narrow, presenting somewhat of the appearance of two 
cones placed base ‘to base, transversely furrowed and banded, but with the surface 
smooth and shining: the spire, formed of seven or eight volutions, is elevated, equalling 
the aperture in length. The whorls are obtusely angulated at the shoulders, round 
which, in the very young state, they present a series of regular, closely set, 
long, narrow, vertical plications, which gradually become more and more faint as 
the shell is enlarged, and ultimately disappear on the fourth or fifth whorl, after 
