﻿306 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mar. 6, 



larly rounded anteriorly, and is a little more produced in that direc- 

 tion than " obscurus " or any of the other varieties. Its umbone is 

 comparatively small, and does not extend much above the hinge- 

 line ; the hinge-line slopes gently inwards, and its ventral margin 

 is regularly rounded and likewise slopes inwards to the posterior ex- 

 tremity. The valves are regularly convex, and the shell is com- 

 paratively thin. 



This pretty form of Ax. dubius is somewhat rare, and has only 

 occurred to me in Lower Limestone at Conisborough, Hampole Stubbs, 

 and Brodsworth. 



Loc. In the Lower Limestone at Bull Hill Quarry and other lo- 

 calities about Pontefract, at "Wentbridge, Hampole, Hampole Stubbs, 

 Moorhouse, Pickburn, Brodsworth, Conisborough, Hooton Pagnell, 

 Emsall, and Barnborough Cliff; on Prof. King's authority it likewise 

 occurs at Garforth Cliff, Woodhall, and Nosterfield. — In tipper Lime- 

 stone at Knottingley, Loversall, Wadworth, and south of Bobin 

 Hood's Well. 



7. Mackodojt striates, Schlotheim, Denksch. Akad. Miinch., vol. vi. 



p. 31, pi. 6. fig. 3. 

 Syns.' Cucullcea sulcata, Phillips*; Area tumida, J. Sowerby; A. 

 antiqua, Minister; A. Loftusiana, Howse ; A. Kingiana, De 

 Yerneuil. 



Three separate valves of this species have occurred to me in the 

 Lower Limestone. Their size is very small compared with Durham 

 examples, being apparently of stunted growth. The largest is half- 

 an-inch in width. 



Loc. Moorhouse, and Holywell Hill (Conisborough). 



8. Leda spelencaria, Geinitz, Yersteinerungen Zech., p. 9, pi. 4. 



fig. 6. 

 Syn. Leda Vinti, King. 



I possess two specimens of this interesting species from the Lower 

 Limestone of Moorhouse. One is a good cast of a right valve with a 

 portion of the shell adhering to one extremity ; the other is a bad 

 cast of a left valve. The former is about |-ths of an inch in width, 

 and differs little from Durham specimens, except in being rather 

 more acuminate posteriorly, and in having the umbonal ridge much 

 broader and stronger than they. 



Beachiopoda. 



1. Terebratela elongata, Schlotheim, Denksch. Akad. Miinch., 

 vol. vi. p. 27, pi. 7. fig. 7. 

 Syns. T. sufflata, complanata, lata, communis, and intermedia, 

 Schlotheim. 



Both the typical form of this species and the variety sufflata occur 

 in the Lower Limestone, the individuals of both varying in relative 

 length and width in different localities, but never attaining so large 

 a size as in Durham. My largest specimen is half an inch long, 



* This is probably the shell noticed by Prof. Pliillips. under the name of Cu- 

 cullcea, as occurring in the neighbourhood of Ferry Bridge. See Phil. Mag., new 

 series, 1828, p. 401. 



