370 



CAMBKIAN BEACHIOPODA. 



absence of an area on the dorsal valve distinguish it. It appears to be a form interniediate in 

 development between Bustella, with its absence of cardinal areas and its very rudimentary 

 pedicle aperture, and Oholus, with its well-defuied cardinal areas with their pedicle grooves. It 

 occurs in large numbers and its dark smooth shell is a very striking object in the buff-gray 

 sandstone. 



Formation and locality. — ^Upper Cambrian : (82b) " St. Croix sandstone " along the railroad track near Taylors 

 Falls, Chisago County, Minnesota. 



Family OBOLID^ Bang. 



Subfamily OBOLINJE BaU. 



Genus OBOLTJS Eicli-wald.a 



[li/JsMr, a coin.l 



Obolus EiOHWALD, 1829, Zoologia specialis, vol. 1, p. 274. (Described in Latin as a new genus.) 



Unguliten Pander, 1830, Beitrage zur Geognosie des russischen Reiches, pp. 55-58. (Described and discussed in 



German.) 

 Ungula Pander, 1830, idem, pp. 57-58. (Proposed as a new genus on p. 57 and described in German.) 

 Ungulites Quenstedt, 1837, Archiv fur Naturgeschichte, von A. F. A. Wiegmann, Jahrg. 3, Bd. 1, pp. 143-145. 



(Refers to Pander's new genus Ungula as " Ungulites" and describes the genus in German.) 

 Orthh VON BucH (in part), 1841, Archiv fiir Mineralogie, Bd. 15, Hft. 1, p. 7. (Merely describes and discusses Obolus 



apollinis as "Orthis ungula," and refers tho species to the " Unguliten," the text being in German.) 

 Unguliten Pander, von Buch, 1841, idem, p. 7. (The description of this group is incorporated with that of the species 



"Orthis ungula" (Obolus apollinis), the text being in German.) 

 Obolus Eichwald, de Verneuil, 1845, GMogie de la Russie d'Europe, by Murchison, de Verneuil, and de Keyserling, 



vol. 2, pt. 3, p. 291. (The genus is discussed in French in the third and fourth paragraphs on p. 291, under 



Obolus apollinis; see Matthew, 1892, pp. 43-44, for translation.) 

 Obolus Eichwald, Kutorga, 1848, Verhandl. Russ.-kais. min. Gesell. St. Petersburg for 1847, No. 12, pp. 250-253. 



(Discussed in German.) 

 Aulonotreia Kutorga (in part), 1848, idem, pp. 278-279. (Described in German as a new genus, the species in the 



genus belonging with Obolus, Obolus (Acritis), and Obolus (MieJcwitzella). 

 Obolus Eichwald, Morris, 1849, Annals and Mag. Nat. Hist., 2d ser., vol. 4, pp. 319-320. (Discussed.) 

 Obolus Eichwald, Davidson (in part), 1853, British Fossil Brachiopoda, vol. 1, introduction. No. 3, pp. 135-136. 



(Described and discussed. The species referred to the genus belong with Obolus, Obolus (Acritis), and Obolus 



{Michwitzella). Two of the species, Obolus davidsoni and Obolus transversa, are Ordovician forms and are not taken 



up in this monograph.) 



a The synonymy Jor this -genus does not give a complete record of the various genera under which the species now included in Obolus were 

 formerly placed; it gives only those references in which the genus is discussed or described. To complete the record for the species taken up in 

 the monograph the following mere generic references are listed: 



Obolus von Leuehtenberg |1S43, p. 16]. 

 Orbimla Owen [1S52, p. 683]. 

 Lingula Billings [1859, p. 431]. 

 Obolus Schmidt [1861, p. 218]. 

 Lingula Billings [1863, p. 124]. 

 Lingulepis Hall [1863, pp. 129 and 130]. 

 Lingula BilUngs [lS65a, p. 216]. 

 Obolusf Billings [lS65b, p. 362]. 

 Lingulepis Hall [1867, p. 107]. 

 Lingula Barrande [1868a, p. 100]. 

 Obolus? Barrande [1868a, pp. 104 and 105]. 

 Lingula Barrande [1868b, p. 690]. 

 Obolus? Barrande [lS68b, p. 693]. 

 Lingulella? Meek [1871, p. 185]. 

 Obolus Billings [1872a, p. 218; 1872c, p. 356]. 

 Obolus Kayser [1876, p. 9]. 

 Obolus Roemer [1876, PI. II, figs. 7a-c]. 

 Obolella Hall and Whltfleld [1877, p. 205]. 

 Lingulepis Hall and Whitfield [1877, p. 206]. 

 . Lingula Barrande [1879b, Pis. CVI: iv; OX; vm; CXI: 

 I, and CXI: VI]. 

 Obolus? Barrande [1879b, Pis. XCV: iv; CXI: vi; 



CXIII: t; CXXVI:n; and CLII: n]. 

 Obolus Noetling [1883, p. 205]. 

 Lingulella Kayser [1883, p. 35]. 

 Lingulepis Walcott [1884b, p. 12]. 

 Obolella Walcott [1884b, p. 14], 

 Obolus Roemer [1886, p, 23 (270)]. 

 Obolella? Walcott [1886b, p. 111). 



Lingulella Walcott [1889c, p. 441). 



Obolus Gagel [1890, p. 21]. 



Lingula Bomemann [1891, p. 438]. 



Obolella Bomemami [1891, pp. 439 and 440). 



Lingulella? Hall and Clarke [1892c, p. 61]. 



Obolella?? Hall and Clarke [1892o, pp. 69 and 73]. 



Lingulella Keyes [1894, p. 38]. 



Lingulella Matthew [1895b, p. 255]. 



Lingula Sardeson [1896, p. 95). 



Scfimidtia Mickwltz [1896, p. 19]. 



Glossina Schuchert [1897, p. 224]. 



Lingulella? Walcott [1897a, p. 404]. 



Obolus ^Lingulella) Walcott [1898b, pp. 404, 412, 415, 



416, 418, and 419; 1899, pp. 443 and 445; 1901, p. 673]. 

 Obolus Walcott [1901, p. 684]. 

 Obolus Matthew [1902c, pp. 94 and 96]. 

 Obolus (Monobolina') Matthew [1902e, p. 98]. 

 Lingulella Matthew [1902c, p. 108]. 

 Obolus (.Lingulella) Walcott [1902, p. 605]. 

 Lingulella Matthew [1903, p. 62]. 

 Obolus Matthew [1903, p. 76]. 

 Monobolina Matthew [1903, p. 210]. 

 Obolus Walcott [1905a, pp. 324, 325, 326, 327, and 328j. 

 Obolus {Lingulella) Walcott [1905a, pp. 328, 330 , and 



331]. 

 Ololus Moberg and Segerberg [1906, p. 05] 

 Obolus Walcott [190Sc, p. 244; 1908d, pp. 61, 62, and 



63]. 



