NERIN^A. 207 



140. Nerintba zonophora, sp. nov. Plate XIV, fig. 7. 



Description : 



Spiral angle (regular) .... 14°. 

 Height of whorl to width . . . 1 : 1"3. 



Approximate length . . . .50 mm. 



Shell cylindro-conical, turrited. Number of whorls about fourteen, strongly 

 concave, the principal depression median. Sutural carina prominent and 

 extremely thick, the suture being in the centre of the carina. Columella 

 ? hollow, with closed umbilicus. The apical whorls present fine and very slightly 

 granulated spiral lines ; two in the earliest whorls, and increasing to four, and 

 possibly more, lower down. The section is triplicate, and differs but little from 

 that of N. Weldonis. 



Belations and Distribution. — Distinguished from N. Weldonis by the greater 

 constriction of the whorls, which is median, and by the great thickness of the 

 sutural belt ; the whorls are longer and the spiral angle narrower than in 

 N. Eudesii, It bears a certain resemblance to N. tumentisutura, Piette,^ but the 

 internal section is very different. 



Rare in the Lincolnshire Limestone of Weldon. 



141. Nbrin^a subglabra, sp. nov. Plate XIV, fig. 8. 



Description : 



Spiral angle (nearly regular) . . . 12° — 13°. 



Height of whorl to width . . . 1 : 1"25. 



Approximate length . . . .70 mm. 



Shell cylindro-conical, subulate. Whorls probably fourteen, nearly flat ; 

 sutural varix not prominent, merely a rim on the posterior margins. The middle 

 whorls are ornamented with four or five granulated spirals, which seem to die out 

 gradually, the last two whorls being smooth. [The figured specimen shows the 

 lines of growth in this portion of the shell.] Umbilicus closed ; it is uncertain if 

 columella be solid or not. Section triplicate, with one small anterior fold on the 

 columella very low down. 



Belations and Distribution. — Differs from such forms as PI. XIV, fig. 6, in its 

 greater smoothness of outline and freedom from turriting, and in some minor points. 

 It approaches N. Sharmanni, Rig. and Sauv. (' Bathonien du bas Boulonnais,' 



' See CossmaiiD, op. cit., p. 197, pi. xvii, figs. 49 — 51, where N. tumentisutura, though described 

 in the text as a Ptygmatis, is figured as a triplicate Nerinaea. 



