srnrrnKUTl INDEX AND lilBLIOGRAPHY. 275 



Obolella gemma llilliiins. Lower Cambrian. 



Obolellii j;eiuiiiii liillings, Ciiiiiulian Nat. (Jeol., ii. ser., VI, 1S71, p. 217, fij;. 5; — 

 American Joiir. .Sci., Ud new, III, ISTU, j). 'A'>1, fig. 5. — Walcott, liull. 17. S. Geol. 

 Survey, 30, 188(), p. IKi, pi. 10, fig. 2;— Tenth Ann. Reii. U. S. Geol. Survey, 1891, 

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

 Pt. I, 1892, p. 71, fig. :{0; pi. 2, figs. 42-44. 



Loc. Bic and St. Simon li.irljors, l)elo%v Quebec, Canada; Troy, New York. 



Obolella (?) gemmula ^lattbeM*. Upper Cambrian. 



Obolella ( ?) gemmula Matthew, Trans. Koyal Soc. Canada, IX, 1892, ji. 41, ]d. 12, 



tigs. 8a-8c. 

 Lov. Near St. John, New Brunswick. 



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



Obolella Ida Billings, Pal. Fossils, I, 18H2, p. 71, iig. (>3, on p. 68. 

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

 Loc. Point Levis, Canada. 



Obolella misera Billings = Linnarssonia ndsera. 



Obolella minuta (Hall and Wliittield). Upper Cambrian. 



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

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

 Loc. Enreka 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, Smitlisouiau Cont. to-Kuowl- 

 edge, XIY, 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. 



Obolelhi 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 W^ashington County, New York ; Hanford Brook, New Brunswick. 

 Obolella pectenoides (Whitfield). Upper Cambrian. 



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



p. 103, figs. 1-3. 

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



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

 Lor. Black Hills, South Dakota. 



Obolella polita Hall. Middle Cambrian. 



Obolus appolinus 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, Lseil.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, pl.l.fig.2. 



DiceUomus polita Hall, Twenty-third Rep. N. Y. State Cab. Nat. Hist., 1873, p. 246. 



