862 BULLETIN 92, UNITED STATES NATIONAL MUSEUM. 



Obolus cyane (Billings). 



Lingula cyane Billings, Geol. Surv. Canada, Pal. Fosa., 1, 1865, p. 216, figs. 



200a-d, p. 215. 

 Glossina cyane Sckuckert, Bull. U. S. Geol. Surv., 87, 1897, p. 224. 

 Obolus cyane Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 388, pi. 27, figs. 4a-b. 

 Chazyan (Quebec — P): Four miles northeast of Portland Creek, Newfoundland. 



Obolus (Lingulella) desiderata Walcott. See Lingulella desiderata and Obolus 

 rotundatus. 



Obolus discoideus (Hall and Whitfield). 



Obolella discoidea Hfll and Whitfield, U. S. Geol. Expl. 40th Par., 4, 1877, p. 



205, pi. 1, figs. 1 and 2.— Walcott, Mon. U. S. Geol. Surv., 8, 1884, p. 14; Bull. 



U. S. Geol. Surv., 30, 1886, p. 111.— Hall and Clarke, Pal. New York, 8, pt. 1, 



1892, p. 69. 

 Obolus (Lingulella) discoideus Walcott, Proc. U. S. Nat. Mus., 23, 1901, p. 673. 

 Obolus discoideus Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 389, pi. 18, figs. 



6a-d. 

 Lowest Ordovician: Blacksmith Fork Canyon, nine miles east of Hyrum, Cache 



County, Utah. Also Upper and Middle Cambrian of Nevada, etc. 

 Plesioty pes. —Cat. Nos. 24555, 51547, U.S.N.M. 



Obolus dolatus (Sardeson). 



Lingula dolata Sardeson, Bull. Minnesota Acad. Nat. Sci., 4, 1896, p. 95, pi. 6, 



fig. 12. 

 Obolus dolatus Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 390, figs. 35A-C. 

 Ozarkian (Oneota): Stillwater, Washington County, Minnesota. 



Obolus (Lingulella) ellsi Walcott. See Lingulella ellsi. 



Obolus (Westonia) elongatus Walcott. 



Obolus (Westonia) elongatus Walcott, Smiths. Misc. Coll., 53, 1908, p. 68, pi. 7, 



fig. 12; Mon. U. S. Geol. Surv., 51, 1912, p. 459, pi. 63, figs. 8-Sd. 

 Middle Ordovician: Wasatch Canyon, about five miles north of Brigham, Boxelder 



County, Utah. 

 Holotype and plesiotypes. — Cat. No. 51722, U.S.N.M. 



Obolus (Westonia) escasoni (Matthew). 



Lingulella(?) escasoni Matthew, Bull. Nat. Hist. Soc. New Brunswick, 4, pt. 4, 



1901, pp. 270-273, pi. 5, figs. la-i. 

 Obolus (Westonia) escasoni Walcott, Proc. U. S. Nat. Mus., 23, 1901, p. 691; Mon. 



U. S. Geol. Surv., 51, pt. 1, 1912, p. 459, pi. 49, figs. la-f. 

 Westonia escasoni Matthew, Geol. Surv. Canada, Rep. Cambrian Rocks Cape 



Breton, 1903, pp. 206-209, pi. 16, figs. la-i. 

 Canadian (Bretonian— Div. C3a, b): McAdam shore, East Bay, Cape Breton, 



Nova Scotia. 



Obolus galtensis Billings. See Rhinobolus galtensis. 



Obolus (Lingulepis) gregwa Walcott (part). See Lingulella (Lingulepis) exigua. 



Obolus (Westonia) iphis Walcott. 



Obolus (Westonia) iphis Walcott, Proc. U. S. Nat. Mus., 28, 1905, p. 336; Mon. 



U. S. Geol. Surv., 51, 1912, p. 462, pi. 49, figs. 4, 4a-d. 

 Lower Ordovician (Pogonip): East of Hamburg Ridge, Eureka District, Eureka 



County, Nevada; also Upper Cambrian of Nevada and Utah. 

 Holotype and paratypes.— Cat. Nos. 51720, 51542, U.S.N.M. 



