84 EOCENE MOLLUSCA. 
subulatd : aperturd magna, in medio dilatatd, anticé coarctatd, spiram in longitudinem 
superanti: plicd columellari compressa, proeminenti, valde obliquatd, obscure sulcata. 
Var. ABBREVIATA; testd anfractibus septem vel octo; spird breviori; aperturd longiort. 
Shell ovate-acute, ventricose, smooth, composed of eight or nine convex volutions, 
of which the first five or six increase slowly, and the last enlarge rapidly; so that the 
spire assumes a conical awl-like shape, while the body-whorl is very ventricose. The 
last two volutions frequently present concentric, obscure, irregular corrugations, giving 
a crumpled appearance to the shell, similar to that which distinguishes the recent 
L. stagnalis. The aperture is large, effuse towards the middle, but contracted at the 
anterior part, and somewhat larger than the spire. The columellar fold is flat, 
prominent, rather strongly twisted, and generally obscurely sulcated. 
A variety occurs (fig. 2c) in which the shell is more ventricose, the whorls fewer, 
the spire shorter, and the aperture proportionally larger, equalling two thirds of the 
whole shell. 
The Z. cavdata, in its general appearance and awl-like spire, much resembles 
L. stagnalis ; but, in the latter species, the whorls are more convex, the body-whorl 
more ventricose, the posterior part of the aperture more effuse, and the columellar 
fold is rounded, smaller, and more oblique. Individuals occasionally occur which, 
from the small degree of convexity in the whorls would, at the first glance, be referred 
to L. fusiformis; but they may be easily separated by the columellar fold, which, in 
the latter species, is rounded, and presents a more graceful spiral than that of 
LI. caudata. 
Size.-—Axis 24 inch, nearly ; diameter 1 inch. 
Localities —Hordwell Cliff and Headon Hill. 
No. 31. LIMNHA PYRAMIDALIS. Desh. Tab. XIII, figs. 2a—, and 3 a—4. 
LYMN©HA PYRAMIDALIS. Desh. 1824—37. Desc. des coq. foss., &c., vol. ii, p. 95, t. 20, 
figs. 14, 15. 
LIMNEA 5 J. Sow. 1825. Min. Con., vol. vi, p. 54, t. 528, fig. 3. 
LIMN®A 33 Bouwill. 1836. Catal., des coq. foss. de Auvergne, p. 124. 
LyMNEE PYRAMIDALE? Brard. 1810. Ann. du Mus., vol. xv, p. 407, t. 24, fig. 2. 
LyMNEUs PyRAMIDALIS? Fér. 1814. Mém. geol., &., p. 60, No. 3. 
L. testé ovato-acutd, ventricosd, levi; anfractibus septem vel octo convexis: apertura 
magna, antice dilatatd, spiram in longitudinem superanti ; labio parum expanso ; columella 
marginatda ; plicd columellart magna, compressa, obliqua, in medio sub-bipartita. 
A smooth, ovate-acute, ventricose shell, composed of seven or eight convex whorls, 
separated by a simple, well-defined, but not deep suture: the aperture, which is fully 
as long as the spire, is large and effuse ; the inner lip but slightly spread over the 
body-whorl, and the columella presents a margin formed by the thickened inner lip, 
and bears a prominent oblique fold, obscurely sulcated. 
