NERIN AA. 205 
varieties of N. Hudesit, Mor. and Lyc., in having a smaller spiral angle and solid 
columella. 
The specimen figured is the only one known; it is said to have come from the 
marly limestone of Longridge, but the matrix is not very characteristic of that bed. 
To be regarded as a doubtful species. 
138. Nertnma Evpesit, Morris and Lycett, 1851. Plate XIV, fies. 2 and 2 a. 
1851. Nerinxa Evpest, Wand LZ. Great Ool. Moll., p. 33, pl. viii, figs. 6 and 6a. 
Bibliography, §c.—Morris and Lycett appear to have had some doubts as to 
the generic’ position of N. Hudesii, comparing it with Cerithivm Defrancii, Desl. 
An examination of the specimens in the Jermyn Street Museum, where the types 
are kept, favours the notion that they really are triplicate Nerinzeas. Moreover, a 
triplicate Nerinea which answers to their figures and description is far from 
scarce in our Great Oolite. Hence Mons. Cossmann (‘ Et. Bathonien,’ p. 216) has 
been misled by the doubts of Morris and Lycett in regarding N. Hudesii as 
identical with C. Defrancii. 
Description of Great Oolite varieties—Spiral angle about 20°. Shell conical- 
elongate, turrited, and often of considerable length. ‘Whorls ten or more, narrow, 
with numerous fine lines of unequal prominence, and much excavated ; sutures 
carinated, the carine sharp. Columella ? hollow, but with closed umbilicus. 
Body-whorl short, and almost as much excavated as the whorls of the spire ; base 
flattened, aperture subquadrate. Section triplicate (fig. 2); one shallow fold in 
the centre of the outer wall, two rather pointed folds on the columellar side, 
which shows a peculiar outline, only to be understood by reference to the figure. 
Specimens from the Lincolnshire Limestone (fig. 2 «), owing to indifferent 
preservation, seldom show the fine spiral lines. They are, on the whole, less 
conical and shorter than these from the Great Oolite. The chief differences are 
in the internal section, especially in the outline of the columellar portion of 
each whorl. 
Relations and Distribution.—N. Eudesii belongs to a group of Nerinzas with 
more or less deeply excavated whorls and prominent sutural carine, which are, on 
the whole, more characteristic of Bathonian beds. Modifications in the spiral 
angle, relative height of whorls, and slight differences in the internal section are 
almost the only points whereon specific differences can be founded, and the value of 
1 The sub-genus Zrochalia, to which they also referred it, should be restricted to trochiform 
shells with an infundibular umbilicus, such as N. pyramidalis (Goldf., pl. elxxvi, 11). 
