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BRITISH CARBONIFEROUS BRACHIOPODA. 



Obs. After a lengthened comparison of numerous specimens of Phillips's Terebratula 

 rhomboidea and T. seminula, it appeared to me evident that the last was nothing more than 

 a young state of the first, and that neither could be distinguished from the Permian Cama- 

 rophoria globulina of Phillips ; the resemblance was indeed so great, that having mixed 

 several specimens of each, it was with some difficulty that they could be afterwards sepa- 

 rated. I was not able to expose the interior, but the single longitudinal median line which 

 can be observed through the transparency of the shell, and which extends for a short 

 distance along the back of the beak, leaves no doubt as to the species belonging to the 

 genus Camarophoria, and not to that of Terebratula or Rhynchonella, as was hitherto 

 supposed. 



All the description given by Professor Phillips of his T. rhomboidea and T. seminula is, 

 that the first ! ^s " no lateral plaits and perforation minute,'' while the second has " one 

 lateral plait," and the "perforation is (also) minute;" but although some specimens of 

 T. rhomboidea show no lateral ribs, other examples present one or two. The fold is also 

 sometimes entirely smooth, one of Professor Phillips's figures denoting that the author 

 was aware of the fact ; and it is to this last variety that Professor M'Coy, at a subsequent 

 period, applied the specific denomination of Ilemithyris longa. We now, therefore, 

 dispense with three so-termed species, and are able to add another to those that are 

 common to the Carboniferous and Permian periods. In PI. XXIV, I have represented 

 the original figures, as well as all the principal variations of shape hitherto discovered. 



Loc. Camarophoria globulina has been found in the Carboniferous limestone of Bol- 

 land and Settle, in Yorkshire; at Longnor, in Derbyshire, &c. Mr. Kelly mentions Cooks- 

 town, Blacklion, and Howth, as Irish localities. I am not acquainted with any Scottish 

 example. It occurs also in the Permian shell limestone of Tunstall and Humbleton 

 Hills, &c. 



Camarophoria (?) laticliva, M'Coy. PI. XXV, figs. 11, 12. 



Camarophoria laticliva, M'Coy. British Paleozoic Fossils, p. 444, pi. iii d, figs. 20, 21, 



1855 (not Atrypa laticliva, M'Coy, Carb. Foss. of Ireland, 

 p. 22, fig. 16, 1844). 



Spec. Char. Transversely rhomboidal, wide, very deeply trilobed, rounded ; both 

 valves convex ; mesial fold elevated, sinus deep ; beak small, incurved, or adpressed to the 

 umbone of the dorsal valve ; foramen small, triangular. Each valve is ornamented with 

 about twelve or thirteen ribs,, of which a few have obscurely dichotomised ; they originate 

 at a short distance from the extremity of the beaks, and proceed from thence to the 

 margin ; three or four compose the fold, two or three the sinus, with wide flattened 

 spaces on either side. One example measured — 



Length 10, width 13^, depth 7 lines. 



