BRACHIOPODA. 211 



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

 either valve on account of the encroachment of the delthyriuin. 



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, 0. 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. Conchyliolitlius aiiomites, Martin. Peti-ef. Devb., tab. xlix, tigs. 13, 14. i 



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



1820. Terehrattdites, Schlotheim. Die Petrefaetenkunde auf ihreni jetzigen Staiidpuiikte, pp. 253, 254. 



1822. Terehratula, Sowerby. Mineral Conchology, vol. iv, p. 25. 



1822. Hysttrulithes, Schlotheim. Peti-efactenkimde, p. 247. 



1836. Splrifera, Phillips. Geology of Yoi-kshire, vol. ii, pi. xi, fig. 12. 



1840. Spirifera, von Buck. 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. ; Kept. Fourtk Dist., p. 215. 



1843. Orthis, de Koninck. Desci-iption des Animaux Fossiles de Belgi(iue, pi. xiii, fig. 9. 



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



1850. ScJiizophoria, King. Monogr. Permian Fossils of England, p. 106. 



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



1S57. OrthU, 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. OHJiis. Hall. Rept. Geol. Surv. Iowa, vol. i, pt. 2, pp. 488, 489, 597. 



1859. OrtJiis, Hall. Pal:eontol<igy 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. Orthi?, Hall. Paheontology 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 Worthen. Geological Survey of Illinois, vol. iii, pp. 423, 424. 

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



1877. Ortliis, 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, Palasontology, p. 326. 



1883. [Schizophoria,] Hall. Rej)t. N. Y. State Geologist for 1882. pi. xxxvi. 



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



1884. Orthis, Walcott. Pala;ontology Eureka District, pp. 114, 115. 



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



