NERIN.EA. • 201 



182. NEBiNyEA ATT15NUATA, Wltchell, 1887. Plate XIII, fig. 6 a. 



1887. NEEiNiEA ATTENUATA, Witchell. Vol. fit., p. 32, pi. i, tigs. 7 aud 8 ; pi. ii, 



fig. 6. 



Description : 



Spiral angle .... 10°— 12°. 



Height of whorl to width . . . 1 : 1*35. 



Approximate length . . . 60 — 70 mm. 



Shell conical-elongate, strongly dimorphous. Whorls about twenty ; those 

 towards the apical end are excavated anteriorly, and the sutural prominence is 

 excessive. Later on the sutural ridges disappear, and the whorls are quite flat 

 and plain, increasing in the form of a regular cone. It is probable that the 

 earlier whorls were ornamented with fine spiral lines, which disappear with the 

 flattening of the whorl. 



Body-whorl smooth and without salience ; aperture widely ovate, canal rather 

 wide. Section triplicate ; an obtuse fold on the outer wall, one very low on the 

 columella, and one on the posterior wall. 



Relations and Distribution. — Although obviously related to Nerindea oolitica, 

 this species differs in its more marked dimorphism, and in the extremely conical 

 figure produced by the lower whorls. The whorls are also relatively rather 

 higher than in the majority of specimens of N. oolitica, and there are slight 

 differences in the internal section. 



It has been found in the Pea-grit of Longfords, in the Oolite Marl of 

 Swift's Hill and Longridge, and possibly also in the Lincolnshire Limestone at 

 Belmisthorpe. 



133. NERiNiEA EXPANSA, sp. nov. Plate XIII, fig. 6b. 



Description : 



Spiral angle .... 15°— 17°. 

 Height of whorl to width . . . 1 : 1*30. 



Approximate length . . . 90 — 100 mm. 



Shell conical-elongate, the spire exhibiting a moderate amount of dimorphism. 

 Number of whorls about eighteen, increasing by steps, but not much excavated, 

 and with only a moderate sutural prominence ; the subapical whorls show traces 

 of fine spiral lines. The later whorls are smooth, nearly flat, and without 

 prominence, whilst the suture is close or even depressed. The aperture is 

 ovate-oblong, and section similar to that of N. oolitica. 



26 



