34 CAMBEIAN BRACHIOPODA. 



Present reference. 



apollinis [Obolus], Billings [1872a, p. 21S] Obolus apolliuis. 



Billings [1872c, p. 356] Do. 



Davidson [18-53, 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 [I860, pp. 925-926] Do. 



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



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



Hall and Clarke [lS92b, 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. 



Koemer [1876, PL II, figs. 7a-c] Do. 



Roemer [1885, pp. 23-24 (270-271)] Do. 



Schmidt [1801, p. 218] Do. 



de Verneuil [1845, pp. 290-292] Obolus apollinis (in part), O. apollinis 



ingricus (in part), Obolus (Acritis) anti- 

 quissimus (in part), and Obolus (Mick- 

 witzella) siluricus (in part). 



Walcott [1898b, PL XXVI, figs. 3-6] Obolus apollinis. 



Westergard [1909, p. 56] Do. 



Zittel [1880, figs. 48Sa-c, p. 664] Do. 



Zittel [1880, fig. 488d, p. 664] Obolus apollinis quenstedti. 



apollinis [Ungulites], Quenstedt [1885, pp. 755 and 756] Obolus apollinis. 



apollinis ingricus [Obolus], Mickwitz [1896, pp. 137-140] Obolus apollinis ingricus. 



apollinis maximus [Obolus], Mickwitz [1896, pp. 140-143] Obolus apollinis maximus. 



apollinis quenstedti [Obolus], Mickwitz [1896, pp. 143-145] Obolus apollinis quenstedti. 



appalachia [Billingsella?], Walcott [1905a, p. 231] Billingsella? appalachia. 



appalachia [Dicellomus], Walcott [1905a, p. 314] Dicellomus appalachia. 



appolinus? [Obolus], Owen [1852, p. 501] Dicellomus politus. 



argenta [Acrotreta], Walcott [1902, pp. 580-581] Acrotreta argenta. 



argenta [Nisusia (Jamesella)], Walcott [1905a, p. 252] Nisusia (Jamesella) argenta. 



argia [Syntrophia primordialis], Walcott [1905a, p. 293] Syntrophia primordialis argia. 



argutus [Obolus (Lingulella)], Walcott [1898b, p. 396] Lingulella arguta. 



artemis [Acrothele], Walcott [1908d, p. 82] Acrothele artemis. 



asiatica [Obolella], Walcott [1905a, p. 297] Obolella asiatica. 



aspera [Lingulella radula], Matthew [1903, pp. 204-205] Lingulella radula. 



atava [Orthis (Plectorthis?)], Walcott [1905a, pp. 259-260] Eoorthis atava. 



atava [Rafinesquina?], Schuchert [1897, p. 338] Do. 



atava [Strophomena], Matthew [1893b, pp. 102-103] Do. 



atava [Strophomena?], Moberg and Segerberg [1906, PL II, figs. 7, 7a-b] .. Do. 



atavus [Leptobolus], Matthew [1899b, pp. 200-201] Lingulella atava. 



Matthew [1903, pp. 106-109] Do. 



atavus [Obolus (Lingulella)], Walcott [1902, pp. 609-610] Do. 



atavus insulse [Leptobolus], Matthew [1903, pp. 110-112] Lingulella atava insUlse. 



atavus tritavus [Leptobolus], Matthew [1903, p. 109] Lingulella torrentis. 



atlantica [Obolella], Burr [1900, p. 47] Obolella atlantica. 



Gorham [1905, PL I, figs. 2a-c] Do. 



Grabau[1900, pp. 620-621] Do. 



Grabauand Shimer [1907, p. 188] Do. 



Matthew [1899d, p. 70] Do. 



Walcott [1890b, p. 36] Do. 



Walcott [1891a, p. 611] Do. 



atlantica [Obolella cL], Delgado [1904, p. 364] Obolella? sp. undt. a. 



Atrypa? lenticularis Dalman [1828, pp. 132-133] Orusia lenticularis. 



Hisinger [1837, p. 76] Do. 



