EDMONDIA ACCIPIENS. 331 



Edmondia accipiens, Sowerby, sp., 1850. Plate XXXVII, figs. 8—16. 



Nucula accipiens, J. de C. Sowerby, 1840. Geol. Coalbrookdale exp., pi. xxxix, 



fig. 4. 

 Unio Urei, J. de C. Sowerby, 1840. Ibid., pi. xxxix, figs. 6, 6 a. 



— paballelus, J. de C. Sowerby, 1840. Ibid., pi. xxxix, fig. 8. 

 Nucula accipiens, Morris, 1843. Cat. Brit. Foss., 1st edit., p. 93. 

 Unio Ubki, Morris, 1843. Ibid., p. 105. 



— paballelus, Morris, 1843. Ibid., p. 105. 



Nucula accipiens, Brown, 1849. Ulus. Foss. Conch., p. 187. 

 Unio Urei, Brown, 1849. Ibid., p. 180, pi. Ixxxviii, figs. 9, 10. 



— paballelus, Brown, 1849. Ibid., p. 180, pi. Ixxxviii, fig. 26. 

 Nucula ? accipiens, Morris, 1854. Cat. Brit. Foss., 2nd edit., p. 210. 

 Unio ? Urei, Morris, 1854. Ibid., p. 230. 



— ? paballelus, 31orris, 1854. Ibid., p. 230. 



Ctenodonta accipiens, Bigsby, 1877. Thesaurus Devonico-Carbouiferus, p. 303 

 Nucula accipiens. Etheridge, 1888. Brit. Foss., pt. 1, Palaeozoic, p. 287. 

 Unio Ubei, Etheridge, 1888. Ibid., p. 291. 



— parallelus, Etheridge, 1888. Ibid., p. 291. 

 Sanouinolites gbandlatus, Etheridge, 1890. Trans. N. Staff. Miu. aud Mech. 



Engineers, vol. x, p. 127, pi. i, fig. 12. 



Specific Characters. — Shell transversely rhomboid-oval, moderately convex, 

 very inequilateral, closed all round. The anterior end is very short, gibbose, and 

 moderately deep from above downwards, its border regularly rounded. The 

 inferior border is long and almost straight for the greater part of its extent, but 

 posteriorly is curved upwards to pass into the posterior border without any 

 angulation. The posterior border is bluntly but regularly rounded, passiug with 

 a regular curvature into the hinge-line. The superior border is long, straight, 

 parallel with the ventral border, curved at either extremity, and somewhat 

 shorter than the greatest antero-posterior diameter of the valve. The umbones are 

 gibbose, raised, incurved aud twisted forwards, contiguous, and placed close to 

 the anterior extremity of the valve. The hinge-line is erect. Lunule and 

 escutcheon absent. The valves are gibbose in front, and gradually compressed 

 in the posterior half. There is no indication of any oblique line or fold in 

 uncrushed specimens, but there is a slight constriction about the centre of the 

 valve, which becomes broader and shallower as it approaches the margin. 



Interior unknown. 



Exterior. — The surface is ornamented with concentric sulci and rugae, which 

 have a direction parallel to the contour of the valve. The rugce are more regular 

 and better marked in the umbonal region ; lower down they often subdivide as 

 they cross the valve, and become split up into bundles of fine striae of growth, the 



