72 CAMBEIAN BRACHIOPODA. 



Present reference. 



Obolella (Acrotreta?) sagittalis Moberg and Segerberg [1906, p. 64] Acrotreta sagittalis. 



Obolella (Glyptias) Walcott [1901, p. 675] Obolella (Glyptias) . 



Walcott [1908e, PL XI, and pp. 142 and 145] Do. 



Obolella (Glyptias) favosa Walcott [1901, pp. 675-676] Obolella (Glyptias) favosa. 



Obolella (Kutorgina) Dall [1S70, pp. 154 and 163] Kutorgina. 



Obolella (Kutorgina) cingulata Billings [lS61b, pp. 8-9, figs. 8 and 10] Kutorgina cingulata. 



Billings [1861b, p. 8, fig. 9] Rustella edsoni. 



Billings [1861c, p. 948, figs. 347 and 349]. . . Kutorgina cingulata. 



Billings [1861c, p. 948, fig. 348] Rustella edsoni. 



Billings [1862e, p. 220, figs. 347 and 349] ... Kutorgina cingulata. 



Billings [1862e, p. 220, fig. 348] Rustella edsoni. 



Obolella (Linnarsaonia) pretiosa Dawson [1890, pp. 53-54] Acrotreta sagittalis. 



Obolella (Orbicula) cselata Ford [1871, p. 33] Botsfordia crelata. 



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



Obolellus? phillipsi Roemer [1876, PL II, figs. 6a-d] Micromitra (Paterina) phillipsi. 



Obelus Dall [1870, pp. 154 and 162] Obolus. 



Davidson [1853, pp. 135-136] Obolus (in part), O. (Acritis) (in part), and 



. 0. (Mickwitzella) (in part). 



Davidson [1866, p. 58] '. Obolus. 



Davidson [1883, p. 218] Do. 



Eichwald [1829, p. 274] Do. 



Eichwald [1860, pp. 924-925] Obolus (in part), 0. (Acritis) (in part) and 



O. (Mickwitzella) (in part). 



Hall and Clarke [1892a, pp. 242-243] Obolus. 



Hall and Clarke [1892b, pp. 558-559] Do. 



Hall and Clarke [1892c, pp. 80-81 and 337-339] Do. 



Kutorga [1848, pp. 250-253] Do. 



Matthew [1892, pp. 43-44] Do. 



Matthew [1903, p. 135] Do. 



Mickwitz [1892, pp. 57-64] Do. 



Mickwitz [1896, pp. H33 (127-129)] : Do. 



Morris [1849, pp. 319-320] Do. 



Oehlert [1887, p. 1261] Do. 



de Verneuil [1845, p. 291] Do. 



Walcott [1898b, pp. 385-386] Do. 



Walcott [1901, pp. 681-683] Do. 



Walcott [19088, PI. XI, and pp. 142 and 144] Do. 



Zittel [1880, p. 664] Do. 



Obolus acadica Walcott [1905a, pp. 324-325] Obolus acadicus. 



Obolus? ad vena Barrande [1879b, PI. XCV, fig. iv] ' Obolus? advenus. 



Obolus aequiputeis Matthew [1902c, p. 94] Obolus selwyni. 



Matthew [1903, p. 139] Do. 



Obolus anceps Walcott [1898b, pp. 388-389] Obolus anceps. 



Obolus antiquissimus Eichwald [1859, PL XXXVII, figs. 5a-d] Obolus (Acritis) antiquissimus. 



Eichwald [1860, pp. 928-929] Do. 



Obolus apollinis Billings [1872a, p. 218] Obolus apollinis. 



Billings [1872c, p. 356] Do. 



Davidson [1853, figs. 51 and 52, p. 136, and PL IX, figs. 



280-284] Do. 



Davidson [1853, PL IX, fig. 285] Obolus (Acritis) antiquissimus. 



Eichwald [1829, p. 274] Obolus apollinis. 



Eichwald [1840, p. 167] Do. 



Eichwald [1843b, p. 140] Do. 



Eichwald [1860, pp. 925-926] Do. 



Gagel [1890, pp. 21-22] Do. 



Hall and Clarke [1892a, figs. 247 and 248, p. 242] Do. 



Hall and Clarke [1892b, figs. 247 and 248, p. 558] Do. 



Hall and Clarke [1892c, p. 80] Do. 



Kutorga [1848, pp. 251 and 252] Do. 



Matthew [1892, pp. 43-44] Do. 



Mickwitz [1896, pp. 133-137] Do. 



Moberg and Segerberg [1906, p. 65] Do. 



Morris [1849, p. 316] Do. 



Noetling [1883, p. 265] Do. 



