Reports and Proceedings — Geological Society of London. 281 



2. "The Limestone-Knolls below Thorpe Fell, between Skipton 

 and Grassington in Craven." By J. E. Dakyns, Esq., M.A. (Com- 

 municated by the President.) 



A band of limestone runs from Cracoe towards the north-east, 

 folded in an anticline and dipping under shales. In several places 

 the top of the limestone is brecciated and the overlying (Bowland) 

 shale contains fragments of limestone. The limestone forms five 

 abrupt conspicuous hills. The rocks in most of these hills are not 

 bedded, and where they are bedded the dip is confusing ; both in 

 exposures outside of these and in adits inside, the limestone in 

 some cases is amorphous and without any sign of bedding. When 

 Mr. Tiddeman propounded his view that the limestone was 

 originally formed in the shape of knolls or mounds, the author 

 accepted his opinion for these particular hills. There is evidence 

 that the surface of limestone underneath the shales is uneven. 

 On Simon's Seat, a Millstone-Grit fell, there are swallow-holes 

 showing that limestone is not far below ; while below Thorpe 

 Fell at least 450 feet of shales overlie the limestone. The author 

 considers the absence of bedding in the limestone to be a very 

 important feature ; for in the country south of the North Craven 

 Fault, though the rock is excessively contorted, its bedding has not 

 been destroyed. 



3. " On three Species of Lamellibranchs from the Carboniferous 

 Eocks of Great Britain." By Wheelton Hind, M.D., B.S., F.E.C.S., 

 F.G.S. 



The first part of this paper describes a new species of Anthra- 

 comya which occurs in the North Stafibrdshire and Manchester Coal- 

 fields at horizons higher than that characterized by A. Phillipsi. 

 The fossil is found at Etruria, Bradwell, Stoke-on-Trent, and 

 Fallowfield. It appears to indicate a special zone of shales and 

 ;SpiVorfe/s-limestone about 300 feet below the Penkhull Sandstone, 

 and to be the onl}'^ molluscan form known from the zone. 



A new species of Carbonicola is next described, partly from 

 specimens previously supposed to be a gasteropod, a bi'achiopod, or 

 even a crustacean, and partly from better-preserved specimens 

 obtained from calcareous bands about 10 yards above the Bassey 

 Mine Ironstone in North Staffordshire. It appears to be the latest 

 species of this genus known, and to occur in higher beds than any 

 other species. 



Lastly, a new species of Ctenodonta from Penton Linns (Dumfries- 

 shire) is described. It occurs in a marine shale below the highest 

 limestone of the locality, in beds referred to the horizon of the 

 Hurlet Limestone by the officers of the Geological Survey. The bed 

 contains gasteropods, crinoids, cephalopods, etc., with Productus 

 giganteus. The species has some resemblance to C. Halli, Barrois, 

 found in Spain. 



