BRACHIOPODA. 211 



bratuliform. In the latter species no trace of the cardinal area remains on 

 either valve on account of the encroachment of the delthyrium. 



In these shells there is occasionally developed a tendency to close the delthy- 

 rium of the brachial valve. This is never carried very far, but in some species 

 where the cardinal process attains a great size, as in 0. Penelope, O. musculosa, 

 and others, it more than fills the delthyrial cavity, pressing upward the thinner, 

 unsupported portion of the cardinal area, where it covers the dental sockets. 



SCHIZOPHORIA, King. 1850. 

 XII, Group of Orthis resupinata, Martin. 



CONCHYLIOLITHUS ANOMITES RESUPINATA, Martin. 



PLATE VI, FIGS. 17, 18, 22-31 ; AND PLATE VIA, FIGS. 23-32. 



1809. Conchyliolithus anomites, Martin. Peti-ef. Devb., tab. xlix, fig-s. 13, 14. 



1813. Anomia, Schlotheim. Min. Taschenbuch, vol. viii, pi. 1, fig-. 6. 



1820. Tei-ebratulites, Schlotheim. Die Petrefactenkuride auf ihrein jetzigen Standpunkte, pp. 253, 254. 



1822. Terebratula, Sowerby. Mineral Concliology, vol. iv, p. 25. 



1822. Bystei-olithes, Schlotheim. Petrefactenkunde, p. 247. 



1836. Spirifera, Phillips. Geology of Yorkshire, vol. ii, pi. xi, fig. 12. 



1840. Spirifera, von Buch. Mem. Soc. Geol. de France, vol. iv, pi. 10, fig. 32. 



1842. Orthis, Vanuxem. Geology of N. Y. ; Rept. Third District, pp. 163, 164. 



1843. Orthis, Hall. Geology of N. Y. ; Rept. Fourth Dist., p. 215. 



1843. Orthis, de Koninck. Description des Animaux Fossiles de Belgique, pi. xiii, fig. 9. 



1844. Orthis, McCoy. Syn. Carb. Fossils Ireland, pi. xx, fig. 20. 



1850. Schizophoria, King. Monogr. Pei'miau Fossils of England, p. 106. 



1851. Hysterolithes, Quenstedt. Handbuch der Petrefact., p. 484. 



1857. Orth'is, Hall. Tenth Rep. N. Y. State Cab. Nat. Hist., pp. 45, 110. 



1857. Orthis, Cox. Owen's Geological Survey Kentucky, vol. iii, p. 570. 



1858. Orthis, Hall. Rept. Geol. Surv. Iowa, vol. i, pt. 2, pp. 488, 489, 597. 



1859. Orthis, Hall. Palaeontology of N. Y., vol. 3, p. 176. 



1859. Orthis, Billings. Hind's Rep. Expl. Assiniboine, Saskatchewan, etc., p. 193. 



1861. Orthis, Davidson. British Carb. Brachiopoda, p. 130. 



1862. Orthis, A. Winchell. Proc. Acad. Nat. Sci. Phil., vol. xiv, p. 410. 



1867. Orthis, Hall. Palseontology of N. Y., vol. iv, pp. 43, 55, 58, 59, 60. 



1868. Orthis, Meek. Transactions Chicago Acad. Sci., vol. i, pp. 88, 90. 



1888. Orthis, Meek and Wohthen. Geological Sui-vey of Illinois, vol. iii, pp. 423, 424. 

 1874. Orthis, Derby. Bull. Cornell University, vol. i, p. 63. 



1877. Orthis, Hall and Whitfield. U. S. Geol. Expl. 40th Par., vol. iv, p. 265. 



1881. Orthis, White. Second Ann. Rept. Bureau Stat, and Geol. Indiana, p. 133. 



1882. Orthis, Whitfield. Geology of Wisconsin, vol iv, pt. 3, Palseontology, p. 326. 



1883. [Schizophoria,] Hall. Rept. N. Y. State Geologist for 1882, pi. xxxvi. 



1883. Schizophoria, Hall. Thirty-sixth Rept. N. Y. State Mus. Nat. Hist., p. 75. 



1884. Orthis, Walcott. Palaeontology Eureka District, pp. Ill, 115. 



1889. Orthis, Nettelroth. Kentucky Fossil Shells, p. 43. 



