354 DR WHEELTON HIND ON THE LAMELLIBRANCH AND 



Regularly convex. Suture lines well depressed ; often a slight ridge immediately above 

 the suture. 



Dimensions. — Specimen No. T2182 B measures: height, 4"5 mm. ; breadth, 1*5 mm. 



Localities. — Moulding Sand Quarry, Garngad Road, Glasgow ; Dumbartonshire, 

 Greenfoot Moulding Sand Quarry, near Gain Farm, 3 miles N. of Coatbridge. 



Observations. — Two specimens of this minute shell have been obtained. It is 

 almost characterless, and I refer it on this account to the very small shell named by 

 de Koninck L. nanum. 



Naticopsis brevispira, de Ryckholt, sp. (PI. II. figs. 52, 53.) 



I described this species as occurring in a marine band below the Gin Mine Coal of 

 the North Staffordshire coalfield (Q. J. Geol. Soc, vol. lxi. p. 533, pi. xxxv. fig. 10). 

 A single specimen has been obtained from Torwood Glen, Stirlingshire. 



Macrocheilina, sp. (PI. II. fig. 59.) 



Fragments of a small elongate shell with a spire of five whorls have been obtained, 

 but it is impossible to determine the species. The height is 4 '5 mm. The specimen is 

 numbered Tl929 B . 



Locality. — Linlithgowshire ; river Avon, W. of the Railway Viaduct, about 

 100 yards below the Mill and \ mile N. of Avonbank. 



Ptychomphalus Marcouianus, Geinitz, sp., 1866. (PL II. fig. 55.) 



Pleurotomaria Marcouiana, Geinitz, 1866, Carb. und Dyas in Nebraska, 1866, p. 10, Tab. i. fig. 10. 

 „ „ Meek and Hayden, 1872, Fin. Rep. U.S. Geol. Surv. Nebraska, p. 223, 



pi. xi. fig. 8. 



Specific Characters. — Shell small, cone rapidly expanding, spire of 5 to 6 whorls, of 

 which the larger comprises nearly the whole of the shell. The upper portion of the 

 whorl is convex, and in the last whorl projects beyond the two keels of the band of the 

 sinus, so that the latter is finally not marginal. It is ornamented with regular close- 

 set spiral ridges. The portion of the whorl above the band of the sinus (i.e. nearer the 

 apex) is flattened, and in the early whorls obliterates the sinus. The ornament consists 

 of spiral bands which are moniliform internally, the points becoming small in each 

 successive row till they become obsolete. 



Dimensions. — PI. II. fig. 55. Specimen No. Tl779 B measures: height, 6 mm.; 

 breadth, 7 mm. 



Localities. — Stirlingshire, Torwood Glen, 2|- miles N.W. of Larbert ; Dumbarton- 

 shire, Greenfoot Quarry, near Gain Farm, 3 miles N. of Coatbridge. 



Observations. — I have referred these specimens to Geinitz's species, trusting to the 

 figures in his and Meek's works. I have been fortunate enough to obtain for study a very 



