EDMONDIA SCALARIS. 327 



E. laminata, var. subl^ivis, var. nov. Plate XXXVI, figs. 13 — 18. 



Description. — Shape as in E. laminata, but the external surface is covered 

 with concentric strias and sulci of unequal strength and size, and the regular 

 markings of E. sculpta are absent. 



Comparative dimensions as in E. laminata, but I have never met with specimens 

 of as large size as obtains in the specific form. 



Observations. — I possess a small series of shells from Thorpe Cloud which 

 possess the general character of E. sculpta, but differ markedly in the ornamenta- 

 tion of the surface. As ornamentation is known to be altered by divers conditions, 

 I have not thought it wise to found a new species on a single character. De 

 Koninck does not seem to have met with any shells like mine, for he gives no 

 figures to which I can in any way refer the specimens. The Geological Survey 

 Museum, Jermyn Street, possesses two specimens, internal casts, from Thorpe 

 (near Grassington ?), which show the details of the interior, and also demonstrate 

 that the variety possesses the ossicle or lamelliform process projecting from the back 

 of the hinge-plate into the umbonal cavity. 



Edmondia scalaris, M'Coy, 1844. Plate XXXVI, figs. 9, 19-22. 



Veneiiupis scalaeis, M'Coy, 1S44. Synops. Carb. Foss. Ireland, p. 67, pi. x, 



fig. 6. 

 Caediomobpha scalaeis, d'Orbiyny, 1850. Prodrome de Paleontol., p. 133. 

 Non Edmondia scalaeis, M'Coy, 1S55. Brit. Palaeozoic Foss., p. 502, pi. 3 h, p. 9G. 

 Veneeupis scalaeis, Griffiths, I860. Journ. Geol. Soc. Dublin, vol. ix, p. 60. 

 Caediomoepha scalaeis, Biff shy, 1878. Thesaurus Devonico - Carboniferus. 



p. 301. 

 Veneeupis scalaeis, Bigsby, 1878. Ibid., p. 31o. 



Edmondia scalaeis, de Koninck, 18S5. Arm. Mus. Hoy. d'Hist. Nat. de Belgique, 



p. 41, pi. x, figs. 25, 26. 

 — — (pars), Etheridye, 1888. Brit. Foss., pt. 1, Palaeozoic, p. 284. 



Specific Characters. — Shell of moderate size, obliquely suboval, very gibbose, 

 inequilateral. The anterior end is short and small, compressed, and produced 

 forwards at the antero-superior angle, which is the most anterior point of the 

 valve. The anterior border curves downwards and backwards rapidly from the 

 angle, so that it appears to be almost obsolete, and in its place is a very extensive 

 convex lower border. The posterior border is broad, bluntly curved, and joins 

 the hinge-line at an obtuse angle. The hinge-line is not quite as long as th 



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