212 CARBONIFEROUS LAMELLIBRANCHIATA. 



ressemblance avec celle que je viens de decrire ; elle en d iff ere par sa taille, qui est 

 plus grande, par la forte depression de son cote posterieur, par allougement de sa 

 charniere et la regularite plus grande des deux series de ses dents cardioales." 

 These differences do not exist, for De Koninck describes the posterior end of 

 C. sinuosa as " retrecie et prolongee en pointe emoussee en arriere ; " the length of 

 the hinge depends on the size of the specimen, and the teeth are always regular. 

 A comparison of the figures given by de Koninck and Barrois respectively does 

 not afford a single point for differentiation of the species. 



Family TRIGONID^J. 



Genus Schizodus, King, in De Verneuil, 1845. 



Tellinites, Schlbtheim, 181G. Acad. Miiucb., vol. vi, p. 31. 



— — 1820. Petrefactenkunde, p. 189. 

 Axinus, Sowerby, 1821. Min. Conch., vol. iv, p. 12. 

 Isocardia, Phillips, 1836. Geol. York?., pt, 2, p. 209. 

 Axinus, Blind, 1838. The Age of the Earth, p. 167. 



Donax ?, Sowerby, 1840. Geol. Coalbrookdale (explau. of plates). 

 Venus ?, Sowerby, 1840. Ibid. 



Cucull^a, Geinitz, 1841. Neues Jahrbuch, p. 138. 

 Axinus, Morris, 1843. Cat. Brit. Foss., 1st edit., p. SO. 

 Isocardia, Morris, 1843. Ibid., p. 88. 



Paciitodon, Brown, 1843. Ann. Mag. Nat. Hist., vol. xii, p. 396. 

 Non Axinus, M'C'oy, 1843. Carb. Foss. Ireland, p. 63. 

 Cardiomorpua (pars), 31'Coy, 1843. Ibid., p. 56. 

 CucuLLiEA, Geinitz, 1813. Gaea von Sachsen, p. 96. 

 Schizodus, King, 1844. Aun. Mag. Nat. Hist., p. 313 (nomen nudum). 



— de Verneuil, 1845. Pal. de Russie, vol. ii, p. 308. 



— Howse, 1S48. Trans. T. N. F. C, vol. i, p. 216. 



— Geinitz, 1848. Versteineruugen Zechsteingebirges, p. 8. 

 Isocardia, Brown, 1849. Illust. Foss. Conch., p. 197. 



Unio (pars), Brown, 1849. Ibid., p. 178. 



Cardiomorpua (pars), d'Orbiyny, 1850. Prodrome de Paleont., p. 133. 



Sciiizodus, King, 1850. Monog. Permian Foss., p. 185. 



Axinus, Morris, 1854. Cat. Brit. Foss., 2nd edit., p. 188. 



Mtopuoria, M'Coy, 1855. Brit. Pal. Foss., p. 495. 



Scuizodus, Eichwald, 1856. Bull. Soc. Imp. Nat. Moscou, tome xxix, 2e partie, 



p. 134. 

 Axinus (Schizodus), Meek and Ilayden, 1858. Proc. Acad. Nat. Sci. Phil., 



p. 262. 

 Schizodus, Eichwald, I860. Lethaea Kossica, vol. i, p. 997. 



