CARBONIFEROUS FOSSILS OF IRELAND. 31 



LOXONEMA SULCULOSA. PJlU. SP. 

 Melania sulculosa. Phil. Gcol. York. 



Sp. Ch. — Elongate ; whorls convex, crossed by arched striae, more strongly marked towards the basal 

 suture. 



This is one of the largest known species, frequently attaining six inches in length ; it is more elongate than 

 the rest, and is moreover remarkable for the strong, waved sulci on the volutions, which very nearly resemble 

 those of the L. nexilis of the Devonian rocks. Length three inches ; diameter of basal whorl one inch three lines. 



LOXONEMA TUMIDA. Plbil. 

 Melania tumida. Phil. Geol. York — Loxonema tiimida. Phil. Pal. Fos. 



Sp. Ch. — Pyramidal, short ; volutions narrow, very convex, crossed by direct, simple strife. 



Tliis species is distinguished by its rapidly tapering form, and narrow, very convex volutions, which are 

 about eight in number ; eacli whorl is about twice as wide as long. Length one inch six lines ; diameter of 

 basal whorl ten lines. 



Loxonema TURRiTA. MCoy. (PI. V. fig. 7). 



Sp. Ch. — Obliquely conical, turreted ; spire composed of four or five rapidly increasing whorls; whorls 

 cylindrical, or flat on the sides, and broadly tabulated above, the two portions separated by a sharp angle ; 

 whorls longitudinally costated with broad, close, rounded ridges, crossed by very fine, sharp, spiral strias. 



This beautiful species does not particularly resemble any Gasteropod of tliis or the allied genera. Length 

 two lines. 



TUERITELLA. Lam. 



Gen. Ch. — Shell elongate, subulate ; whorls very numerous, in general spirally grooved ; mouth round, 

 lips thin ; luiited anteriorly. 



TURRITELLA MEGASPIRA. MCoy. (PL V. fig. 5). 



Sp. Ch. — Subulate, very elongate ; whorls about sixteen or seventeen, flat, smooth, slightly rounded at 

 the sutures; tip of the spire obtuse. 



This species is chiefly remarkable for its length, and the great number of its whorl.s. The dotted restora- 

 tion in the plate is considerably too long, as I find from perfect specimens that tlie spire does not come to a point, 

 but, though composed of an extraordinary number of whorls, it is blunt, and obtusely rounded, resembling that 

 beautiful Brazilian land shell, the Metjaspira Ruschenbergiana. The whorls are flat, or very shghtly convex, 

 shghtly impressed at the sutui-es ; surface perfectly smooth. Diameter of basal whorl six lines ; length of an 

 imperfect specimen of nine whorls one inch ten fines. 



TURRITELLA SUTURALIS. Phil. 

 Turritella suturalis. Phil. Geol. York. 



Sp. Ch. — Conical, smooth; whorls flat, or slightly concave; sutural, and lower edges rounded, pro- 

 minent. 



This species is rendered very remarkable by the prominent, rounded edges of the whorls. Diameter of 

 last whorl seven fines ; length one inch two fines. 



