EDMONDIA. 287 



Edmondia (pars), King, 1849. Permian Fossils, p. 1G2. 



— Brown, 1849. Illust. Foss. Conch., p. 198. 

 Sangcinolites (pars), Brown, 1849. Ibid., p. 219. 

 Caediomoepha (pars), d'Orbigny, 1850. Prodrome de paleont., p. 132. 

 Edmondia (pars), d'Orbigny, 1850. Ibid., p. 133. 



— — M'Coy, 1851. Ann. and Mag. Nat. Hist.,ser. 2, vol. vii, p. 190. 

 Caediomoepha (pars), de Ryckholt, 1852. Mel. paleontol., pt. 2, p. 93. 

 Panopjea (pars) 1852. Ibid., p. 29. 



Solenopsis (pars) 1852. Ibid., p. 64. 



Solemta (pars) — 1852. Ibid., p. 51. 



Caediomoepha, Eiclnvald, 1853-61. Lethaea Rossica, p. 1034. 

 Edmondia (pars), Morris, 1854. Cat. Brit. Foss., 2nd edit., p. 202. 



— M'Coy, 1855. Brit. Pal. Eocks and Foss., p. 499. 



— Shumard and Swallow, 1858. Trans. Acad. Sci. St. Louis, vol. i, p. 209, 



— Swallow, 1860. Ibid., vol. i, p. 635. 



— Salter, 1861. Iron Ores Gt. Brit., pt. 3, p. 221, pi. i, fig. 29. 



— Wincliell, 1862. Proc. Acad. Nat. Sci. Phil., p. 414. 



— — 1863. Ibid., p. 12. 



— — 1865. Ibid., p. 127. 



— Meek and Worthen, 1866. Eep. Geol. Surv. Illinois, vol. ii (Pal.), p. 364. 



— Daivson, 1868-78. Acadian Geology, p. 303. 



— Young and Armstrong, 1871. Trans. Geol. Soc. Glas., pt. 3, p. 51. 



— Stoliczka, 1871. Pal. Indica, vol. iii, p. 66. 



— Meek, 1872. Eep. Pal. Eastern Nebraska, p. 213. 



— Etheridge,jun., 1873. Geol. Mag., vol. x, p. 299. 



— 1876. Ann. Mag. Nat. Hist., ser. iv, vol. xviii, p. 99. 



— Young and Armstrong, 1876. Cat. Foss. West Scotland, p. 53. 



— Bigsby, 1878. Thesaurus Devonico-Carboniferus, p. 307. 



? — Barrois, 1882. Eecherches Terr, anciens des Asturies, p. 345. 



— Walcott, 1884. Mon. U.S. Geol. Surv., Pal. Eureka Dist., p. 245. 

 Beoeckia, de Koninck, 1885. Ann. Mus. ltoy. d'Hist. Nat. Beige, torn, xi, p. 19. 

 Edmondia, de Koninck, 1885. Ibid., p. 28. 



— Etheridge, 1885. Brit. Foss., pt. 1, Paleozoic, p. 283. 



— Miller, 1889. North Amer. Geol. and Pal., p. 478. 



— Worthen, 1890. Geol. Surv. Illinois, vol. viii, p. 121. 



Generic Characters. — Shell transversely ovate, equivalve, close all round, con- 

 vexly swollen. Hinge edentulous, simple and erect, possessing a transverse, 

 deeply situated, thickened ridge, separated from the edge of the valve by a 

 smooth groove. This edge commences below the umbo and passes backwards till 

 it becomes lost. Casts show that there existed, posterior to the hinge-plate, an 

 internal ossicle, elongate, flattened, which was directed outwards and downwards 

 into the cavity of the umbo. External ligament small, contained in a narrow 

 groove at the margin of the valve ; lunule and escutcheon absent. Pallial line 

 entire, usually remote from the margin. External ornament consists of con- 

 centric striae or rue-as. 



