﻿536 DR. WHEELTON HIND ON THE PALEONTOLOGY [Aug. I905, 



Nucula gibbosa, Fleming. (PI. XXXY, fig. 18.) 



This species has a very wide vertical range. It is found in the 

 Calciferous Sandstone Series of Fife, and recurs at various localities, 

 with an increasingly-higher horizon as the beds pass southward, 

 until in the Midlands it ranges from the Pendleside Series to the 

 Coal-Measures, and throughout this great thickness of strata 

 appears unchanged in character. It is never found in pure lime- 

 stone, but had always a muddy habitat. Specimens from the 

 Coal-Measures are in no way dwarfed. 



Localities. — Below the Gin-Mine Coal, North Staffordshire 

 Coalfield ; 300 feet below the Third Grit, Congleton Edge. 



Nucula oblonga, M'Coy. (PI. XXXY, figs. 21 & 21 a.) 



A single fragment of this somewhat rare species was obtained by 

 the collector of the Geological Survey at Nettlebank (North Stafford- 

 shire). I was enabled to examine it, by the kind permission of 

 Dr. P. L. Kitchin, F.G.S. Previously I had not known this species 

 to occur above the shales which overlie the Little Limestone of the 

 Yoredale Series. 



Locality.— North-Staffordshire Coalfield: below the Gin-Mine 

 Coal. 



Nuculana Sharmani, It. Eth. fil. (PI. XXXY, fig. 19.) 



I have seen two examples of this species from the Coal-Measures, 

 one of which shows the multidenticulate hinge, and the narrow 

 escutcheon. This last character is important, as therein it' differs 

 from Nuculana attenuata, for which, from its shape, it might be 

 mistaken. But N. Sharmani is more curved from before backwards. 

 Nuculana attenuata occurs in the Coal-Measures of South Stafford- 

 shire, 60 feet above the Thick Coal at Hamstead. 



Localities. — North-Staffordshire Coalfield : below the Gin-Mine 

 Coal. In Scotland, N. Sharmani rauges from the Calciferous 

 Sandstone Series to the Upper Limestone Series. 



Nuculana acuta (Sow.). (PL XXXY, fig. 20.) 



This is a form which is, so far as known at present, confined 

 to the Coal-Measures ; it is much shorter and more acute than the 

 other species of the genus. 



Localities. — North-Staffordshire Coalfield : below the Gin-Mine 

 Coal. Coalbrookdale Coalfield : above the Pennystone Ironstone. 



Ctenodonta l^virosxris (Portlock). (PI. XXXY, fig. 23.) 



This species is relatively more abundant than the other nuculi- 



form shells. Practically, it has the same range as Nucula gibbosa, 



with which it is nearly always associated. 



Localities. — North-Staffordshire Coalfield : below the Gin-Mine 



Coal. In the Pendleside Series, 500 feet below the Millstone Grit 



at Congleton Edge. 



