274 SYNOPSIS OF AMERICAN FOSSIL I5RACHI0P0DA. [bull. 87. 



OBOLELLA IMlIiiigs— Continued. 



p. 240. — M:itthe\v, Traus. Koyal Soc. Canada, IX, 1892, p. 39.— Miekwitz, 

 Mem. rAcud. Imp. Sci. St. Pdtersl.oiirg, VIII, 189t), p. IK!. 

 Dicellomns Ilall, Twenty-tbiid Rep. N. Y. State Cab. Nat Hist., 1873, p. 2Il>. 



Obolella ambignii W;ilcott=Elkaniii ambigua. 



Obolella atlantica Walcott. Lower Cambrian. 



Ubolella atlantica ^Valcott, Proc. U. S. Nat. Mus., XII, 1889, p. 36;— Tentb Ann. 



Rep. U. S. Geo]. Survey, 18111, p. 611, pi. 71, fig. 1. 

 hoc. Conception Bay, Newfoundland; Attleboro, Massacbusetts. 



Obolella ca^lata TUllings — Lingulella cielata. 



Obolella chromatica liillings. Lower Cambrian. 



Obolella cbromatica Billings, Ceol. Vermont, II, 1861, p. 947, fig. 346;— Pal. 

 Fossils, I, 1861, p. 7, lig. 7;— Geol. Canada, 1863, p. 284, fig. 288.— Hall, 

 Traus. Albany Institute, V, 1867, p. 110. — Billings, American. Jour. Sci., 3d 

 ser., XI, 1876, p. 176, figs. 1-4.— Ford, Ibidem, 3d ser., XXI, 1881, p. 133, figs. 

 3, 4, 5.— Walcott, Hnll. IJ. S. Geol. Survey, 30, 1886, p. 112, pi. 11, fig. 1 ;— Tenth 

 Ann. Rep. U. S. Geol. Survey, p. 611, pi. 71, fig. 2. — Hall and Clarke, Pal. New 

 York, VIII, Pt. I, 1892, p. 70. 



Loi-. Anse an Loup, Canada. 



Obolella cingnlata Billiugs=Kutorgina giugulata. 



Obolella circe Billings. Lower Cambrian. 



Obolella circe Billiugs, Canadian Nat. Geol., n. ser., IV, 1871, p. 218; — American 

 Jour. Sci., Ill, 1872, p. 357.— Wakott, Bull. U. S. Geol. Survey, 30, 1886, p. 

 118, pi. 10, fig. 3;— Tentb Ann. Rep. U. S. Geol. Survey, 1891, }). 611, pi. 71, 

 fig. 3. 



Loc. Trois Pistoles, Canada. 



Obolella crassa (Hall). Lower Cambrian. 



orbicula? crassa Hall, Pal. New York, I, 1847, p. 290, pi. 79, fig. 8. 



Avicula? des.iuamata Hall, Ibidem, 1847, p. 292, pi. 80, fig. 2. 



Obolella crassa Billings, Canadian Nat. Geol., n. ser., VI, 1871, ]>. 218. — Ford, 

 Amer. Jour. Sci., 3d ser., XV, 1878, p. 128;— Ibidem, 3d ser., XXI, 1881, p. 131, 

 figs. 1, 2.— Walcott, Bull. U. S. Geol. Survey, 30, 1886, p. 114, pi. 10, fig. 1.— 

 Sbaler and Foerste, Bull. Mus. Comp. Zool., XVI, 1888, p. 27, pi. 1, fig. 1.— 

 Walcott, Tenth Ann. Rep. U. 8. Geol. Survey, 1891, p. 612, pi. 71, fig. 4.— 

 Hall .md Clarke, Pal. New York, VIII, Pt. I, 1892, p. 70, pi. 2, figs. 31-36. 



Obolella desiiuamata Billings, Canadian Nat. Geol., n. ser., VI, 1871, p. 217, fig. 

 6; — American Jour. Sci., 3d ser., Ill, 1872, p. 355, fig. 6. 



Obolella (Orbiculaf) crassa Ford, American Jour. Sci., 3d ser., II, 1871, p. 33. 



Dicellomns crassa Hall, Twenty-third Rep. N. Y. State Cab. Nat. Hist., 1873, p. 

 246, 1)1. 13, figs. 6-9. 



Obolella chromatica (lap. crassa) Walcott, American Jour. Sci., 3d ser., XXIX, 

 1885, p. 116, figs. 1, 2;— Ibidem, XXX, 1890, j). 21. 



Loc. Troy and Schodack Landing, New York; North Attleboro, Massachusetts; 

 St. Simon and Bic Harbor, below Quebec, Canada. 



Obolella desiderata l>illiugs=EIkania desiderata. 



Obolella desquamata Billings = Obolella crassa. 



Obolella (?) discoidea I lall and VVhitlield. Up. Camb. and Pogonip (Ord.). 



Obolella (liscoideallallandWhitfield, King's U. S. Geol. Kx])l. 10th Pari., IV, 1877, 

 p. 203, pi. 1, figs. 1, 2.— Walcott, Mon. U. S. Geol. Survey, VIII, 1884, p. 14. 



Obolella? discoidea Walcott, Bull. U. S. Geol. Survey, 30, 181'6, p. 111.— Hall 

 and Clarke, Pal. New York, VIII, Pt. I, 1892, j). 69. 



Luc. Eureka district, Nevada. 



