324 CARBONIFEROUS LAMELLIBRANCHIATA. 



Edmondia laminata, Phillips, sp., 1836. Plate XXXVI, figs. 1—7, 10—12, 31. 



Lucina? laminata, Phillips, 1836. Geol. Torks., pt. 2, p. 209, pi. v, fig. 12. 

 Caedinia ? laminata, de Koninck, 1842. Carb. Eoss., p. 78, pi. H, tigs. 9 a— c. 

 Cardiomorpha sulcata, de Koninck, 1842. Ibid., p. 109, pi. ii, figs. 18 a, b. 

 Astarte quadeata, M'Coy, 1844. Carb. Toss. Ireland, p. 55, pi. xi, fig. 4. 

 Caediomoepha sulcata, de Verneuil, 1845. Geol. de la Kussie, vol. ii, p. 303, 



pi. xx, figs. 2 a — c. 

 Lucina ? laminata, Morris, 1845. Cat. Brit. Foss., 1st edit., p. 89. 



— Brown, 1849. Illust. Foss. Couch., p. 217. 



Caedium laminatum, d'Orbigny, 1850, Prodrome de Paleontol., p. 131. 

 ? Caediomoepha oleisosa, de Byckholt, 1852. Melanges paleontol., 2e partie, 



p. 93, pi. xiii, figs. 1 and 2. 

 Pholadomta tornacensis, de Byckholt, 1852. Ibid., p. 37, pi. x, figs. 3, 4. 

 Ltonsia quaduata, d'Orbigny, 1852. Prodrome de Paleontol., p. 129. 

 Lucina ? laminata, Morris, 1854. Cat. Brit. Foss., 2nd edit., p. 20S. 

 Caediomoepha laminata, Morris, 1854. Ibid., p. 190. 

 Edmondia quadeata, Morris, 1854. Ibid., p. 202. 



Caediomoepha laminata, Bigsby, 1878. Thesaurus Devonico-Carbonif., p. 301. 

 Edmondia quadeata, Bigsby, 1S78. Ibid., p. 307. 



— sculpta, de Koninck, 1885. Ann. Mus. Eoy. d'Hist. JS T at. de Belgique, 



torn, xi, p. 42, pi. xi, figs: 20, 21, 44, 46. 



— tornacensis, de Koninck, 1885. Ibid., p. 44, pi. xli, figs. 4 — 7. 

 Caediomorpha laminata, Etheridge, 1888. Brit. Eoss., pt. 1, Palaeozoic, p. 280. 

 Edmondia quadrata, Etheridge, 18S8. Ibid., p. 283. 



Specific Characters. — Shell below medium size, transverse, subquadrately oval, 

 inequilateral, moderately gibbose. The anterior end is very short, gradually 

 curved to the margin, and has an almost semicircular border ; but where it passes 

 into the inferior margin the curve is the arc of a larger circle than the upper part. 

 The lower border is regularly and very slightly convex, except at the extremities. 

 The posterior margin is broader than the anterior, and is obtusely rounded. The 

 hinge-line is somewhat arched produced posteriorly. The umbones are small, 

 regularly gibbose, pointed, incurved, and twisted forwards, somewhat elevated 

 above the rest of the valve, and situated in the anterior quarter of the shell. 



The valves are regularly convex from above downwards and before backwards, 

 the greatest convexity being about the centre of the dorso-ventral diameter, but 

 in front of the centre of the antero-posterior diameter. Towards the posterior 

 end and along the dorsal slope the valve is somewhat compressed. No escutcheon 

 or lunule. 



Interior. — Unknown. 



Exterior. — The surface is ornamented with very regular, simple, erect, con- 

 centric, fine ridges, separated by smooth, regular grooves. These ridges are 



