35 
suture during the earlier stages of growth, but become quite 
plain during the later period, suture line faintly shown, aperture 
rather short, columella solid, with three folds, the anterior fold 
angulated, having three angles, the middle one simple and 
rather obtuse, the posterior fold bifurcated. On the wall are 
three folds, the anterior and middle of which are slightly 
bifurcated, the posterior one truncated; there is also a minute 
fold on the posterior wall. Spiral angle 10°. 
The suture of this shell shows under a magnifier a very 
narrow open furrow, the edges of which are sharply defined. 
The internal structure differs little if anything from that of 
N. Oppelensis, Pl. I, fig. 8a, and N. consobrina, Pl. I, fig. 10. 
Externally it differs in its more conical and shorter figure and 
longer aperture. 
Locality.—Swift’s Hill, Stroud, in the marly limestone. 
Coll. W. H. Huptzston, Hsq., F.R.S. 
Nerin@/a ciypeata, Wite.,n. sp. Pl. II, fig. 5, 5a. 
Shell small, whorls numerous, their height equal to three- 
fifths of their diameter, convex in the upper or posterior portion, 
thickened beneath the suture in the middle and anterior por- 
tions, encircled with several faint lines, which disappear with 
growth, apex acute, the whorls contracting rapidly towards the 
apex, the first whorls very small, aperture rather elongated, 
internal structure unknown. 
This shell is in a crystalline condition, which prevents the 
internal character from being ascertained. It is distinguished 
from other species by the large number of whorls, in proportion 
to the length of the shell, and their convex appearance. 
Locality.—Rodborough Hill, in the Clypeus Grit. 
d2 
