NERIN.EA. 205 



varieties of A^. Eiidesii, Mor. and Lye, 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. Nerinjia. Eudesii, Morris and Lycett, 1851. Plate XIV, figs. 2 and 2 a. 



1851. NEBiNiEA. Eudesii, M. and L. Great Ool. Moll., p. 33, pi. viii, figs. 6 and 6 a. 



Bihliograjphy , 8fc. — Morris and Lycett appear to have had some doubts as to 

 the generic' position of N. Eudesii, comparing it with Gerithium 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 Nerin^as. Moreover, a 

 triplicate Nerinxa 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 iV". Eudesii as 

 identical with G. Defrancii. 



Description of Glreat 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 carinse 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 a), 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 Neringeas with 

 more or less deeply excavated whorls and prominent sutural caringe, which are, on 

 the whole, more characteristic of Bathonian beds. Modifications in the spiral 

 angle, relative height of whorls, and slight diSerences in the internal section are 

 almost the only points whereon specific differences can be founded, and the value of 



^ The sub-genus TrocJialia, to which they also referred it, should be restricted to trochiform 

 shells with an infundibular umbilicus, such as N. pyramidalis (G-oldf., pi. clxxvi, 11). 



