CARBONIFEROUS BRACHIOPODA. 
285 
niferoiis Limestone of Settle, in Yorkshire. A little later Mr. Joseph Wright, of Cork, 
forwarded me several specimens which he had got out of the Carboniferous 
Limestone of Little Island, Cork, Ireland, In all those three localities the shell was 
stated to be rare. Our British examples agree in every respect with those described and 
figured by Prof. L. de Koninck from the Carboniferous Limestone of Vise, in Belgium, 
where it is stated to be equally uncommon. It may likewise be observed that in 
nearly all the specimens I have seen there exists in the smaller valve a short median rib, 
but in one of the Yorkshire specimens the rib was scarcely definable. I have not seen 
this species from Scotland. 
24. Rhynchonella Glassii, Bern. Sup., PL XXXIII, fig. 10. 
Shell small, elongated, oval, truncated in front ; valves moderately convex. In the 
dorsal valve a median sinus or depression commences about the middle of the valve and 
extends to the front. In the ventral valve a corresponding fold begins also at about 
the middle of the shell and extends to the front. Beak rather produced and incurved ; 
foramen situated under its angular extremity. Surface of valves smooth. 
Length 4, breadth 3, depth 2 lines, 
Obs. — Of this species I have seen two examples only, which were found by Mr. 
Carrington in the Carboniferous Limestone at Wetton, in Stafibrdshire. It is remark- 
able on account of the depression in the anterior half of the dorsal valve and corre- 
sponding fold in the ventral one. I have not been able to examine its interior. I have 
named it after the Rev. Norman Glass, who has been so successful in developing the 
spiral processes in the Spiriferidse, and to whom I am indebted for much valuable 
assistance. 
25. Rhynchonella Brockleyensis, Sup., PI. XXXIV, figs. 14, 14 «, 14 ^. 
Shell small, trigonal, broadest anteriorly, tapering posteriorly, somewhat compressed. 
Dorsal valve moderately convex, with three short angular ribs, commencing at about two 
thirds of the length of the valve and extending to the front, posterior two thirds of the 
shell and lateral portions smooth, without ribs. Mesial fold of small elevation, and 
composed of three short ribs. Ventral valve rather less convex, or deep, than the 
opposite one ; sinus broad and of moderate depth, divided longitudinally by two angular 
