NERITOPSIS. 343 
numerous coarse spiral bands, forming very prominent nodes at the intersections. 
Aperture nearly circular. 
Relations and Distribution.—From Neritopsis varicosa, M. and L., this species 
may be distinguished by its more angular and transverse form, by the almost 
aborted spire, and by the exaggerated character of the radial coste. It is nearly 
related to Neritopsis Hebertana, d’Orb., and might perhaps be regarded as little 
more than a variety. The spiral belts are more numerous and less salient than 
seems to be the case with d’Orbigny’s species. 
This bizarre form was first noticed in the ‘‘ Base-bed ”’ at Lincoln, whence I 
have obtained some characteristic specimens since the one figured on the 
accompanying plate was drawn. A single specimen from the Nerinca-bed in the 
Pea-grit at Crickley. 
277. Nerivopsis, cf. HEBERTANA, @’Orbigny, 1852. Plate XXVIII, figs. 3a, 3b, 3c. 
1852. Neriropsts Hepertana, d’Orbigny. Terr. Jur., vol. ii, p. 221, pl. cece, 
figs. 1—4. 
Description : 
Height. ‘ : ; . 12°5 mm. 
Width : : : . 15mm. 
Shell transversely oblong, angular, thick; spire very short, composed of two or 
three angular and rugosely ornamented whorls set in a sutural hollow, and 
developing into a relatively enormous body-whorl, which is transversely oblong 
and very angular. Four extremely prominent spiral bands are decussated by 
radial coste of nearly equal strength; the points of intersection are marked by 
nodes which must have been extremely spinous. Aperture subcircular and wide, 
but not sufficiently preserved in the available specimens for correct diagnosis. 
Relations and Distribution.—There is something in this form not exactly lke 
Neritopsis, and yet on the whole I think it must be regarded as an extremely rugose 
relative of Neritopsis Hebertana. There are two specimens from Stoford (North 
Dorset), and I have seen two more, which are stated to have come from the 
Inferior Oolite at Bathford. 
