﻿S4 



BRITISH CARBOXIFEROUS BRACHIOPODA. 



did not belong to the same species, nor even to the genera to which they had been referred. 

 Both are undoubted Af/ij/ri/s, but the Carboniferous shell has puzzled me much, and it 

 was onlv after having consulted Professor de Koninck that I ventured doubtfullv to suggest 

 that M'Coy's 31. phalrena, and some other similar specimens I had obtained from Ireland, 

 might perhaps belong to Professor de Koninck's 31. squamlgera, the peculiar reticulated 

 surface still preserved on some portions of M'Coy's specimen (in the collection of Sir R. 

 Griffith) being very similar to that described by the Belgian palaeontologist Athyris 

 ■squamiyera is stated by Professor de Koninck to be nearly related to A. Boyssii, but that 

 it differs by its greater transversity, depth of sinus, aud external sculpture. 



Loc. A. squamiytra is mentioned by Mr. Kelly to occur in the Carboniferous limestone 

 and calcareous slate of Lisnapaste, Clonea, St. Doulough's, in Ireland. Sir R. Griffith's 

 specimen is labeled Ballinaeourty, Dungarvan, and I have another from Miliecent, Ireland. 

 I am not acquainted with any English or Scottish examples. It was found in the Carbo- 

 niferous limestone beds of Tournay, in Belgium, by Professor de Koninck. 



Athyris Royssii, VEoeiOl Plate XVIII, figs. 1—11. 



Spibifeb de Royssii, L'Eveille. Memoirs de la Societe Geologique de France, vol. ii, 

 p. 39, pi. ii, figs. IS— 20, 1835. 



— glabristeia, Phillips. Geol. of Yorkshire, vol. ii, p. 220, pi. x, fig. 19, 1836. 



— fimbriate. Ibid., p. 220, not figured. 



Terebkatcla Royssii, De Vermont. tulletin de la Socie'te Geologique de France, to1. xi, 

 p. 259. pi. iii, fig. 1, b, e, d (not 1, a, and e), 1S-40. 

 — — De Koninck. Animaux Fossiles du terrain Carbonifere de la Bel- 



gique, p. 300, pi. xxi, fig. 1 (but not pi. xx, fig. 1), 1843. 

 Athybis depressa, JI'Coi/. Synopsis of the Characters of the Carboniferous Fossils of 

 Ireland, p. 14", pL xviii, fig. 7, 1S44. 



— ue Royssii, M'Coy. British Palaeozoic Fossils, p. 433, 1855. 



— GiABBisTBiA, M'Cay. Ibid., p. 434. 



Spec. Char. Circular, or transversely oval ; subgiobose ; beak incurved, and truncated 

 by a small circular foramen which is contiguous to the umbone of the dorsal valve. The 

 valves are almost equally aud uniformly convex up to a certain age, after which a broad 

 mesial fold of greater or lesser elevation is gradually formed in the dorsal valve, and a 

 corresponding sinus in the ventral one. The frontal margin is, therefore, either nearly 

 straight or presents a greater or lesser curve ; the external surface is regularly covered by 

 numerous concentric scalv ridges, from each of which radiate closelv-set fringes of elon- 

 gated, somewhat flattened spines. In the interior, the hinge is strongly articulated, the 

 dental or rostral plates in the ventral valve offering, by their position, much solidity to the 

 beak of the ventral valve. The hinge-plate is perforated close to its summit by a minute 



