﻿CAMAROPHORIA.. 



115 



endeavoured to represent some of the others. The marginal expansions are rarely obtained, 

 on account of the hardness of the limestone matrix ; but small portions were distinctly 

 visible on several of the specimens that came under my observation, and I must refer the 

 reader to p. 20, and PI. II, of my 1 Permian Monograph,' wherein he will find perfect 

 exteriors and interiors of the species both represented and described. None of the 

 Carboniferous specimens showed perfectly the interior arrangement, but the median septum 

 and conjoined dental or rostral plates of the ventral valve, as well as portions of the 

 septum which supports the spatula-shaped process in the dorsal one, could be distinctly 

 seen in several examples. 



Loc. Martin mentions that his shell was not common at Winster and Cromford, but 

 it does not appear to be very rare in the Lower Scar limestone of Settle, in Yorkshire, 

 whence many examples have been obtained by Mr. Burrow ; and it is probable that 

 Gilbertson's specimens in the British Museum were derived from some locality in the 

 same county. It has been found also in the Carboniferous limestone of Dovedale, in 

 Derbyshire, and in West Lothian, Scotland, by the late Dr. Fleming. Professor de Koninck 

 has obtained specimens exactly similar to our own in the Carboniferous limestone of Vise, 

 near Liege, in Belgium ; and several Russian localities have been already mentioned. 



Camarophoria globulina, Phillips. PI. XXIV, figs. 9 — 22. 



Terebratula globulina, Phillips. Encyl. Met. Geol., vol. iv, pi. iii, fig. 3, 1834. 



— rhomboidea, Phillips. Geol. York., vol. ii, p. 222, pi. xii, figs. 18 — 20, 



1836. 



— slminula, Phillips. Ibid., figs. 21 — 23. 



Rhynciionella rhomboidea, Morris. A Catalogue of British Fossil?, p. 147, 1854. 

 IIemithyris longa, M'Coij. British Pal. Foss., p. 440, pi. iii d, fig. 24, 1855. 

 Camarophokia globulina, Dav. Mon. Br. Permian Fossils, p. 27, pi. ii, figs. 28 — 31, 1858. 



Spec. Char. Shell small, globular or rhomboidal, either transverse or slightly elongated, 

 entirely smooth up to a certain age. Dorsal valve rather more convex than the ventral 

 one, with a fold of moderate elevation, which, commencing at about the middle of the 

 shell, remains smooth or becomes divided into two or three (rarely four) angular ribs ; the 

 lateral portions of the valve are entirely smooth, or possess one or two short ribs on either 

 side, close to the margin. The dorsal valve presents a rather deepened sinus, which, com- 

 mencing at about the middle of the shell, extends to the front, with one or two short ribs 

 along its middle ; the beak is small and incurved, but showing between its extremity and 

 the hinge line a small foramenal aperture. No marginal expansions; shell structure 

 impunctate. Dimensions variable ; three examples measured — 

 Length 5£, width 6, depth 4 lines. 



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