274 SYNOPSIS or AMERICAN FOSSIL 15RACHI0P0DA. [bull. 87. 



OBOLELLA liilliiigs — Continued. 



p. 240.— Matthew, Trims. Koyal Soe. Canada, TX, 1892, p. 39.— Miekwitz, 

 Mem. I'Ac-ad. Imp. Sci. St. r^torsbonrjr, VIII, WM), p. IK!. 

 Dicelloiiins Hall, Twenty-third Rep. N. Y. State Cab. Nat Hist., 187;$, p. 24tj. 



Obolella anibign;i Walcott=Elkaiiia anibigua. 



Obolella atlantica Walc.ott. Lower Cambrian. 



Obolella atlantica Walcott, Proc. IT. S. Nat. Mus., XII, 1889, p. 36;— Tenth Ann. 



Rep. U. S. Geol. Survey, 1891, p. 611, pi. 71, fig. 1. 

 Loc. Conception IJay, Newfoundland ; Attle.boro, Massachusetts. 



Obolella cielata Billings—Lingulella cielata. 



Obolella chromatica Billings. Lower (Jambrian. 



Obolella cbroiuatira Billings, Geol. Vermont, II, 1861, p. 947, fig. 346;— Pal. 

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

 Trans. 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, Bull. U. 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. 



Loc. Anso an Loup, Canada. 



Obolella cingnlata Billings=Kutorgina ciugulata. 



Obolella circe Billings. Lower Cambrian. 



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

 Jour. Sci., Ill, 1872, p. 3.57.— Wakott, Bull. U. S. Geol. Survey, 30, 1886, p. 

 118, pi. 10, fig. 3;— Tenth Ann. Rep. U. S. Geol. Survey, 1891, p. 611, pi. 71, 

 fig. 3. 



Loc. Trois Pistoles, Canada. 



Obolella crassa (Hall). Lower Cambrian. 



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



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



Obolella crassa Billings, Canadian Nat. Geol., n. ser., VI, 1871, p. 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.— 

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

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

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



Obolella desquamata Billings, Canadian Nat. Geol., n. ser., VI, 1871, p. 217, tig. 

 6;— American Jour. Sci., 3d ser.. Ill, 1872, p. 35,5, fig. 6. 



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



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

 246, pi. 13, figs. 6-9. 



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

 1885, p. 116, iigs. 1, 2;— Ibidem, XXX, 1890, p. 21. 



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

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



Obolella desiderata Billings=Elkauia desiderata. 

 Obolella desquamata Billings = Obolella crassa. 



Obolella (?) discoidea Hall and Whitfield. Up. Camb. and Pogonip (Ord.). 

 Obolelladiscoidea Hall and Whitfield, King's U. S. Geol. Expl. 40th 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, 1826, p. 111.— Hall 



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

 Loc. Eureka district, Nevada. 



