﻿RHYNCHONELLA. 



Ill 



B. Rhynchonella (?) semisulcata, M'Coy. PI. XXV, fig. 13. 



Atrypa semtsulcata, M'Coy. Synopsis of the Characters of the Carboniferous Fossils of 

 Ireland, p. 157, pi. xxii, fig. 15, 1844. 



" Spec. Char. Orbicular, depressed ; beak small ; mesial fold broad, flat, with about 

 five strong, rounded, radiating ridges, continued to the beak ; sides smooth, or very finely 

 striated longitudinally. This species is very remarkable, from the coarsely ridged mesial 

 fold, and nearly smooth sides. Length seven lines, width eight lines." (M'Coy.) 



05s. From not having been able to procure determinable specimens of this shell, I 

 cannot speak as to its generic or specific claims. Through the kindness of Sir R. Griffith 

 I have been able to examine the original example from which M'Coy's lower figure was 

 drawn ; but this is simply a flattened, obscure impression on a slab of what Sir R. 

 Griffith calls " black calp slate," from Walterstown Skreen, and not very correctly repre- 

 sented either in the plate. Mr. Kelly informs me that the shell has been found in what 

 he considers to be " coal shales," at Culkagh, Ballintree, and Walterstown, in Ireland. 



C. Rhynchonella or Camarophoria (?) pkoava, Phillips. PI. XXV, fig. 10. 



Terebratula proava, Phillips. Geology of Yorkshire, vol. ii, p. 223, pi. xii, fig. 37, 

 1836. 



" Spec. Char. Beak produced ; radiations obtuse ; mesial fold square. Strongly allied 

 to the Oolitic species T. obsoleta and T. socialis, &c." (Phillips.) (Carboniferous limestone) 

 Bolland. 



05s. The original specimen may be seen at the British Museum, it forms part of the 

 Gilbertsonian Collection, but several other shells which do not belong to the species are 

 evidently attached to the same tablet. 



The specimen on which Professor Phillips created his species is of an elongated oval 

 shape, with nineteen or twenty small ribs on each valve, but which become obsolete at the 

 beaks ; the mesial fold is of but small elevation above the general convexity of the valve, 

 and is ornamented by five ribs ; the sinus is shallow. Length eight, breadth seven, depth 

 five lines. 



Notwithstanding the examination I was able to make of the original specimen, I felt 

 uncertain as to its being a good species. It might possibly be a Camarophoria, and 

 perhaps even an abnormal shape of Camarophoria crumena (?). Until more 

 material shall have been procured, it will be safer to consider T. proava as one of the 

 doubtful or uncertain species. 



