286 CARBONIFEROUS LAMELLIBRANCHIATA. 



Dimensions. — PI. XXVII, fig. 12, a cast, measures — 



Antero-posteriorly . . . .23 mm. 



Dorso-ventrally . . . .14 mm. 



Laterally . . . . .8 mm. 



Localities. — England : — In a calcareous grit in the Millstone-grit series of Pule 

 Hill, Marsden. Ireland : in arenaceous shale, river Bannagh, Drumcurren. 



Observations. — The type specimen, fig. 9, PL XXVII, of M'Coy's Sedgwickia 

 attenuata — a left valve, not, as shown in his figure, a right valve — is preserved in 

 the Museum of Science and Art, Dublin, and is a very poor example on which to 

 found a species. However, the description seems to do very well for a shell which 

 is very plentiful iu a curious ochreous, calcareous grit on Pule Hill. This shell 

 occurs generally in the form of casts, but some idea of the exterior can be obtained 

 from hollow casts. I have referred this shell to Sedgwickia on account of its 

 edentulous hinge, truncate posterior end, and oblique ridge. 



The fauna of this bed is a curious one ; the following species occur in it, all in 

 the form of casts : 



Myalina Flemingi, M'Coy. Bellerophon TIrei (very common). 



— Verneuilii, M'Coy. Lingula, sp. 



Schizodus antiquus, Hind. Gonitites, sp. 



Many species of Gasteropoda. 



I think that the bed is somewhat low down in the grit series of Pule Hill. 

 Sedgwickia attenuata is more transverse than any other species of the genus, 

 and is not likely to be confounded with any of them. 



Genus Edmondia, de Koninck, 1843. 



Coebula ?, Phillips, 1836. Geol. Yorks., pt. 2, p. 209. 

 Lucina ?, Phillips, 1836. Ibid., p. 209. 

 Isocaedia (pars), Phillips, 1836. Ibid., p. 209. 

 Edmondia, de Koninck, 1843. DeBc. des Anim. foss., p. 66. 

 Caediomoepha (pars), de Koninck, 1843. Ibid., p. 109. 

 Luteaeia, Portlock, 1843. ltep. Geol. Co. Londonderry, p. 441. 

 Edmondia, Morris, 1843. Cat. Brit. Foss., p. 88. 

 Lucina ?, Morris, 1843. Ibid., p. 89. 

 Luteaeia, Morris, 1843. Ibid., p. 91. 



— M'Coy, 1844. Synops. Carb. Foss. Ireland, p. 52. 

 Astaete, M'Coy, 1844. Ibid., p. 55. 

 Edmondia?, M'Coy, 1844. Ibid., p. 52. 

 Veneeupis, M'Coy, 1844. Ibid., p. 67. 

 Sanguinolites (pars), M'Coy, 1844. Ibid., p. 48. 

 Caediomoepha, de Verneuil, 1845. Geol. Eussie, p. 303. 

 Alloeisma (pars), de Verneuil, 1843. Ibid., p. 298. 

 Scaldia (pars), de Byckholt, 1847. Mel. paleontol., pi. x, figs. 27, 28. 



