EDMONDIA GOLDFUSSI. 309 



hinge-line, but continuous below with the general convexity of the valve. The 

 valves are gently and regularly convex from before backwards and from above 

 downwards. Internal to the umbonal swelling is a narrow, depressed, elongated 

 trench, in the anterior part of which was placed the external ligament. 



Interior. — Unknown. 



Exterior. — The surface is ornamented with groups of fine concentric lines of 

 growth, separated by somewhat deeper grooves and more conspicuous in the 

 lower and newer portion of the valve ; the umbonal region is almost smooth. 

 The greatest convexity is about the centre of the valve; shell thin. 



Dimensions. — Fig. 4, PI. XXX, measures antero-posteriorly (estimated) 95 mm., 

 dorso-ventrally 71 mm., side to side 39 mm. 



Localities. — Ireland : the Carboniferous Limestone of Little Island, co. Cork. 



Observations. — This species does not seem to have been described before from 

 Great Britain. Fig. 4, PI. XXX, is in the cabinet of Mr. J. Wright, of Belfast, 

 and was obtained from Little Island, co. Cork. 



De Koninck has described three species under the names Broeclda gigantea, 

 B. depressa, and B. subsequalis, the two former of which I have no hesitation in 

 regarding as one species. Of B. depressa that author says, " Cette grande et belle 

 espece se distingue facilement de ses voisines, et particulierement du Broeclda 

 gigantea, par sa forme moins ovale et par sa faible epaisseur relativement a sa 

 longeur." B. gigantea is said to have the following proportions, but a large part 

 of the posterior end is absent : " longeur 114 mm., hauteur 75, epaisseur 60 mm. 

 B. depressa, 1. 115, h. 72, e. 40." 



E. gigantea is less convex, more quadrate, and much deeper in the dorso- 

 ventral diameter than E. primseva ; it wants the transverse sulcations which 

 characterise E. erpansa. 



Bdwondia Goldfussi, de Koninck. Plate XXXII, figs. 7 — 11. 



Edmondia Goldfussi, de Koninck, 1885. Ann. Mus. d'Hist. Nat. Belgiquc, 



torn, xi, p. 31, pi. xii, figs. 11, 12. 



Specific Characters. — Shell of medium size, broadly ovate, slightly oblique, 

 convex, inequilateral. The anterior end is deep from above downwards, short, 

 compressed, with its border almost straight above, but the curvature below is that 

 of an arc of a circle, where it sweeps round into the ventral margin, wbich is much 

 less convex in its median portion, but behind curves upwards to pass into the 

 posterior border, which is regularly rounded, almost semicircular. The hinge-line 

 is arched, forming more or less of an angle with the anterior edge, but bebind 



40 



