358 



CARBONIFEROUS LAMELL1BRANCHIATA. 



that the shell possessed hinge-teeth like Nucula can be correct. The shell is so 

 unlike this genus in every important character, and I feel certain that it should 

 be more correctly referred to Cypricardella. I have adopted M'Coy's name for 

 the Scotch shells with a certain amount of hesitation, for the poorness of the 

 type and the meagreness of the description make it impossible to be absolutely 

 certain as to its identity. 



In England I have only obtained specimens of this species from a bed of shale very higli up in 

 the Toredale series of the Upper Eden Valley (loc. supra ait.). This shale has an interesting marine 

 fauna, and is exposed in a little stream marked on the map as the Earaday Gill, which carries off the 

 water from the west flank of the Nine Standards. The position of the shale is probably between the 

 Underset and the Main Limestones, but it may be really higher up in the series. The stratigraphical 

 succession is as follows, but some of the Limestones are evidently repeated by a fault. 



Thin coal smut. (Series continued.) 



Shales. 



Thin coal. 



Black shales. 



Sandstone. 



Limestone, thick, with large corals. 



Black and grey shales becoming calcareous, 

 very fossiliferous. With C. rectangularis, 

 etc. 



Limestone, thick; ? Underset Limestone. 



Sandstone. 



Shales with stigmaria. 



Yellow stigmarian clay. 



Thin sandstone. 



Shales. 



Thin coal. 



Sandstone. 



Dark shales. 



Slack sandstone with plant remains. 



Shales. 



Limestone (? 3 yards limestone). 



Sandstones. 



Shales. 



Grit. 



Shales. 



Limestone (5 yards limestone). 



Shale. 



Grit. 



Shales. 



Coal. 



Underclay. 



Grits. 



Sandstones and shales. 



Limestone (scar or middle limestone). 



Massive grit, forming top of hill. 



Shales, much obscured by peat. 



Massive grit. 



Sandy micaceous shales with fragments of 

 marine shells. 



Grit, soft and red, very fossiliferous, contain- 

 ing Product as semireticulatus,P. cora, Spiri- 

 fera trigonalis, Sp. lineata, Sp. glabra, Sp. 

 ovalis, Streptorhynchus crenistria, Athyris 

 ambigua, JBellerophon, sp., Pleurotomaria, sp. 



Fine sandstones. 



Thin sandy shales. 



Muddy micaceous shales. 



Chert. 



Black cherty limestone. 



Brown shales. 



Sandstone, thick. 



Sandy shales. 



Sandstone full of plaut remains. 



Sandstone, massive. 



Shales, micaceous. 



Limestone, thick white, with encrinites ; ? Main 

 Limestone. 



Sandstone. 



Shales. 



Thin coals. 



Sandstone. 



Sandy shales. 

 Black earthy shales. 



Thin limestone. 



Earthy shales. 

 Limestone. 

 Sandstone. 

 Sandy shales. 

 Blade shale with thin sources of sandstone 

 near the base 



