78 CAMBRIAN BRACHIOPODA. 



Present reference. 



Orbicella Dall [1877, p. 50] Kej'serlingia (in part). 



Dana [1846] Does not equal Keyserlingia. 



Hall and Clarke [1892a, p. 254] Keyserlingia. 



Hall and Clarke [1892b, p. 570] Do. 



d'Orbigny [1850, p. 20] Do. 



Orbicella buchi Hall and Clarke [1892a, p. 254] Keyserlingia buchi. 



d'Orbigny [1850, p. 20] Keyserlingia buchi (in part). 



Orbicula de Verneuil [1845, p. 288] Keyserlingia. 



Orbicula buchi de Verneuil [1845, pp. 288-289] Keyserlingia buchi. 



Orbicula cajlata Hall [1847, p. 290] Botsfordia caelata. 



(Orbicula) cailata [Obolella], Ford [1871, p. 33] Do. 



Orbicula? crassa Hall [1847, p. 290] Obolella crassa. 



(Orbicula?) crassa [Obolella], Ford [1871, p. 33] Do. 



Orbicula prima Owen [1852, p. 583] Obolus matinalis. 



(Orbicula) primseva [Discina], de Verneuil and Barrande [1860, p. 532]. . . Acrothele primaeva. 



orbiculatus [Obolus celatus], Moberg and Segerberg [1906, p. 65] Obolus (Schmidtia) celatus. 



Westergard [1909, p. 56] ' Do. 



Wiman [1902, p. 62] Do. 



orbiculatus [Obolus (Schmidtia) celatus], Mickwitz [1896, pp. 163-165] Do. 



Orbiculoidea Hall and Clarke [1892c, pp. 120-137] Orbiculoidea. 



d'Orbigny Do. 



Walcott [1908e, PL' XI, and pp. 142 and 147] Do. 



Orbiculoidea pileolus Hall and Clarke [1892c, p. 137] Orbiculoidea pileolus. 



ordovicensis [Lingula?], Moberg and Segerberg [1906, p. 63] Lingulella lepis. 



orientalis [Billingsella], Hall and Clarke [1892c, p. 230] Billingsella orientalis. 



Walcott [1905a, pp. 239-240] Do. 



orientalis [Iphidella labradorica], Walcott [1905a, pp. 305-306] Micromitra (Paterina) labradoricaorientalis. 



orientalis [Orthisina], Walcott [1886b, p. 120] Billingsella orientalis. 



Walcott [1891a, p. 613] Do. 



Whitfield [1884, p. 144] Do. 



orientalis [Syntrophia], Walcott [1905a, p. 292] Huenella orientalis. 



orientalis [Yorkia?], Walcott [1906, pp. 569-570] , Yorkia? orientalis. 



ornatella [Iphidea], Gronwall [1902, p. 40] Micromitra (Iphidella) ornatella. 



Hall and Clarke [1892c, pp. 97-98] Do. 



Linnarsson [1876, pp. 25-26] Do. 



ornatella [Iphidea cnf.?]. Hall and Clarke [1892c, PI. IV, figs. 6 and 7]. . . .Micromitra (Paterina) superba. 



orta [Acrothyra signata], Matthew [1902b, pp. 385-386] Acrothyra signata orta. 



Matthew [1903, pp. 89-90] Do. 



orthia [Syntrophia], Walcott [1905b, pp. 11-12] Syntrophia orthia. 



Orthis von Buch (in part) [1841, p. 7] Obolus. 



Orthis barabuensis A. Winchell [1864, p. 228] Syntrophia barabuensis. 



Orthis bavarica Barrande [1868a, p. 99] Eoorthis bavarica. 



Barrande [1868b, p. 690] Do. 



Orthis billingsi Hartt [1868, pp. 644-645] : Protorthis billingsi. 



Hartt [1878, pp. 644-645] Do. 



Hartt [1891, pp. 644-64.5] Do. 



Matthew [1886, p. 43] Do. 



Walcott [1884a, pp. 17-18] Do. 



Orthis christianise Brogger [1882, p. 48] Eoorthis christianise (in part) and E. 



daunus (in part). 



Gagel [1890, pp. 10 and 34] Eoorthis daunus. 



Kjerulf [1865, pp. 1 and 3] Eoorthis christianise. 



Pompeckj [1902, p. 7] Eoorthis daunus. 



Remele [1881, p. 69] Do. 



Remele [1885, p. 6] Do. 



Roemer [1885, pp. 36, 37, and 38] Do. 



Orthis coloradoensis Meek [1870, p . 425] Eoorthis desmopleura. 



Shumard [1860, p. 627] Billingsella coloradoensis. 



Orthis desmopleura Meek [1872, p. 295] Eoorthis desmopleura. 



Orthis? eurekensis Schuchert [1897, p. 286] Orusia? eurekensis. 



Orthis eurekensis Walcott [1884b, pp. 22-23] Do. 



Orthis exporecta Linnarsson [1876, pp. 12-13] Billingsella exporrecta. 



