SCHUCHERT.] 



INDEX AND BIBLIOGRAPHY. 275 



Obolella gemma Billings. Lower Cambrian. 



Obolella oemma Billings, Canadian Nat. Geol., a. ser., YI, 1871, p. 217, fig. 5; — 

 American Jour. Sci., 3d ser.. Ill, 1872, p. 357, iig. 5.— Walcott, Bull. U. S. Geol. 

 Survey, 30, 1886, p. 116, pi. 10, fig. 2 ;— Tenth Ann. Rep. U. S. Geol. Survey, 1891, 

 p. 612, pi. 71, fig. 5; pi. 72, Iig. 2.— Hall and Clarke, Pal. New York, VIII, 

 Pt. I, 1892, p. 71, fig. 30; pi. 2, figs. 42-44. 



Lov. Bic and St. Simon liarbors, below Quebec, Canada; Troy, New York. 



Obolella (?) gemmula Matthew. Upper Cambrian. 



( (bolella ( ?) gemmula Matthew, Trans. Royal Soc. Canada, IX, 1892, p. 41, pi. 12, 



ligs. 8a-8c. 

 Loc. Near St. John, New Brunswick. 



Obolella (?) ida Billings. Upper Cambrian and Calciferous (Ord.). 



Obolella ida Billings, Pal. Fossils, I, 1862, p. 71, fig. 63, oa p. 68. 

 Obolella ? ida ^Valcott, Bull. U. S. Geol. Survey, 30, 1886, p. 111. 

 Loc. Point Levis, Canada. 



Obolella misera Billings =Liuuarssonia niisera, 



Obolella minuta (Hall and Whitfield), Upper Cambrian. 



Liugulepis ? minuta Hall and AYhitfield, Rep. Geol. Expl. 40th Pari., IV, 1877, 

 p. 206, pi. 1, figs. 3, 4.— Walcott, Mon. U. S. Geol. Survey, VIII, 1884, p. 13. 

 Loc. Eureka district, Nevada. 



Obolella nana Meek and Hayden, Middle Cambrian. 



Obolella nana Meek and Hayden, Proc. Acad. Nat. Sci. Philadelphia, 1861, p. 

 435.— Billings, Pal. Fossils, 1, 1862, p. 67.— Hayden, American Jour. Sci., 

 2d ser., XXXIII, 1863, p. 73. — Meek and Hayden, Smithsonian Cont. to Knowl- 

 edge, XIV, 172, 1864, p. 4, pi. 1, fig. 3.— Whitfield, Powell's Geol. Geogr. Sur= 

 vey Rocky Mountain Region, 1880, p. 340, pi. 2, figs. 14-17.— Hall and Clarke, 

 Pal. New York, VIII, Pt. I, 1892, p. 69. 



Loc. Black Hills, South Dakota. 



Obolella nitida Ford. Lower Cambrian. 



Obolella nitida Ford, American Jour. Sci., 3d ser., V, 1873, p. 213.— Walcott, Bull. 



U. S. Geol. Survey, 30, 1886, p. 118, pi. 11, fig. 2;— Tenth Ann. Rep. U. S. Geol. 



Survey, 1891, p. 612, pi. 72, fig. 1.— Hall and Clarke, Pal. New York, VIII, 



Pt. I, 1892, pp. 69, 70.— fMatthew, Trans. N. Y. Acad. Sci., XIV, 1895, p. 125, 



pi. 2, fig. 8. 

 Loc. Troy, and Washington County, New York ; Hanford Brook, New Brunswick. 



Obolella pectenoides (Whitfield). Upper Cambrian. 



Obolus pectenoides Whitfield, Ludlow's Rep. Reconn. Black Hills, Dakota, 1875, 



p. 103, figs. 1-3. 

 Obelus'? pectenoides Whitfield, Powell's Geol. Geogr. Survey Rocky Mountain 



Region, 1880, p. 338, pi. 2, figs. 18, 19. 

 Loc. Black Hills, South Dakota. 



Obolella polita Hall. Middle Cambrian. 



Obolus api)olinu8 Owen (non Eichwald), Geol. Survey Wisconsin, Iowa, Minne- 

 sota, 1852, pi. IB, figs. 9, 11, 15, 20. 



Lingula? polita Hall, Ann. Rep. Geol. Survey Wisconsin, 1861, p. 24; — Geol. Rep. 

 Wisconsin, I, 1862, pp. 21, 435. 



Obolella ? polita Hall, Sixteenth Rep. N. Y. State Cab. Nat. Hist., 1863, p. 133> 

 pi. 6, figs. 17-21;— Trans. Albany Institute, V, 1867, p. 112. 



Lingulepis prima Meek and Hayden, Smithsonian Cont. to Knowl., XIV, 172, 1864, 

 p. 3, pi. 1, fig. 2. 



Dicellomus polita Hall, Twenty-third Rep. N. Y. State Cab, Nat, Hist., X873, p. 246. 



