GASTEROPODA. 35 



whorls is nearly smooth. It occurs in all the shelly beds of the formation in Minchin- 

 hampton district, and may be discovered in every quarry, sometimes in great numbers. 



The smallness of the object, and the state of preservation, renders it difficult to obtain 

 a good section of the interior ; the folds upon the columella have been but imperfectly 

 disclosed, but there is little doubt that they are as above described ; the aperture is usually 

 more narrow than is represented at fig. 8a. 



Locality. Minchinhampton Common ; Eparcy, France. 



STRICKLANDI. Plate VII, fig. 9, 9a. 



N. Testa cylindrico-subulatd, anfractibus latis, planatis, superne leviter convexis, suturis 

 profundis impressis ; cingulis scabris aut crenulatis, numerosis et approximatis, superne 

 evanesccntibus : aperturd, plicisque ignotis. 



Shell cylindrical or subulate ; whorls wide, numerous, flattened, or very slightly convex 

 on their upper portions, their sutures strongly marked; the whorls are encircled with 

 numerous, closely-arranged, scabrous, or crenulated lines, which are nearly obsolete upon 

 their upper portions : aperture and plica3 unknown. 



The character of the surface much resembles Cerithium tortile, Deslongchamps ; but the 

 whorls in that shell are much more convex and narrow ; in the present species the length 

 of the whorls perpendicularly is about equal to their transverse diameter. 



Locality. The Stonesfield slate on the borders of Minchinhampton Common has 

 furnished our specimens ; they have occurred rarely, and only in fragments ; when perfect, 

 the length must be considerable. 



NERIN^EA PUNCTATA, Volts. Plate VII, fig. 10, 10a, 6, c. 



NEKIN.BA PHNCTATA, Volts, and Bronn. Jahrb., 1836, p. 559, t. 6, fig. 23. 

 Bronn. Index Palseont., p. 803. 



N. Testa turrito-conicd, anfractibus sub-gradatis, cingulatis, cingulis binis ternisve nodu- 

 losis ; columella solidd, biplicatd, labro dextro uniplicato. 



Shell elongated, conical, with a regular spiral angle of about 18; whorls flat, pro- 

 jecting at the upper part beyond the whorl above, and thus giving a step-like outline to the 

 shell; ornamented with two or three transverse finely-knotted rings: columella solid. 

 Three internal folds, viz.: one strong sharp fold on the middle of the outer lip; one smaller 

 fold on the columella, a little lower than the former, and a blunt thick fold on the top of 

 the whorl near to the columella. Aperture rhoniboidal, rather higher than wide. 



This is a more regular and elegant shell than N. Voltzii, to which it is so nearly allied, 

 that worn specimens of the two species may easily be confounded: in that case the 

 N.punctata may be distinguished by its step-like outline, flatter base, and longer and 



