318 CARBONIFEROUS LAMELLIBRANCHIATA. 



of Messrs. Young and Armstrong, as I find specimens of E. transversa bear this 

 name in the cabinets of Scotch collectors. The former species now referred to 

 Cardiomorpha is, as far as I can ascertain, not present in the Carboniferous series 

 of the West of Scotland. 



Edmondia sulcata, Phillips, sp., 1836. Plate XXXIII, fig. 15; Plate XXXIV, 



figs. 3, 5, 6,6a; Plate XXXV, figs. 5, 11. 



Hiatella sulcata (pars ?), Fleming, 1828. Hist. Brit. Anim., p. 461. 

 Sanguinolaeia sulcata, Phillips, 1836. Geol. Yorks., pt. 2, p. 209, pi. v, fig. 5. 



— — M'Coy, 1844. Synopsis Carb. Foss. Ireland, p. 50. 



— — (pars), Morris, 1845. Cat. Brit. Foss., p. 100. 

 Allorisma eegulabis (pars), de Verneuil, 1845. Geol. Kussie, vol. iii, p. 298, 



pi. xxi, figs. 11 a, b. 

 Edmondia sulcata, King, 1849. Permian Foss., p. 164, pi. xx, figs. 1 — 4. 

 ? Sanguinolaeia sulcata, Brown, 1849. Illustr. Foss. Conch., p. 220. 



Pholadomta sulcata, cTOrbigny, 1850. Prodrome de Paleontol., p. 128. 

 ? Solejiya paeallela, de Ryckholt, 1852. Mel. pal., 2e partie, p. 51, pi. xi, 



figs. 11, 12. 

 Edmondia sulcata, M'Coy, 1S55. Brit. Pal. Foss., p. 503. 



— — Bigsby, 1878. Thesaurus Devonico-Carboniferus, p. 307. 



— — Etheridge, 1888. Brit. Foss., pt. 1, Palaeozoic, p. 284. 



Non — — Tomquist, 1896. Fossilfiihr. untercarbon sudvogesen, vol. ii, 



p. 142, pi. xix, figs. 2, 3. 



Specific Characters. — Shell of medium size, inequilateral, oblong-oval, mode- 

 rately convex, close all round. The anterior end is short, and narrower from 

 above downwards than any other part of the shell, convexly curved into the edge, 

 which is regularly and almost semicircularly rounded. The inferior border is ex- 

 tended and almost straight for the greater part of its extent, but is regularly and 

 almost semicircularly rounded at each extremity, where it is continuous with the 

 curvature of the anterior and posterior borders. The latter is convexly rounded, the 

 upper part being the segment of a larger circle than the lower. The hinge-line is 

 almost straight, much shorter than the greatest antero-posterior diameter of the 

 valve. The umbones are small, pointed, elongate, incurved, and twisted forwards, 

 close, not much raised above the hinge-line, and situated in the anterior fifth of 

 the valve. 



The valves are evenly curved from above downwards and before backwards; 

 there is no ridge or constriction, but a certain amount of flattening or compression 

 along the dorsal slope. 



Interior. — The anterior adductor muscle-scar is small, shallow, rounded, and 



