BIBLIOGRAPHIC LIST OF GENERA AND SPECIES. 863 



Obolus (Lingulella) lens Walcott. See Lingulella lens. 



Obolus loperl Walcott. 



Obolus loperi Walcott, Proc. U. S. Nat. Mus., 21, 1898, pp. 389-390; Mon. U. S. 



Geol. Surv., 51, 1912, p. 395, pi. 9, figs. 4, 4a. 

 Upper Cambrian or Lower Ordovician: Cement Creek, southeast of Crested Butte, 



Ouray County, Colorado. 

 Holotype and paratypes.— Cat. No. 27303, U.S.N.M. 



Obolus maera (Hall and Whitfield). 



Lingulepis maera Hall and Whitfield, TJ. S. Geol. Expl., 40th Par., 4, 1877, p. 



206, pi. 1, figs. 5-7.— Walcott, Mon. U. S. Geol. Surv., 8, 1884, pp. 12, 13. 

 Lingulella? maera Hall and Clarke, Pal. New York, 8, pt. 1, 1892, p. 61 (gen. 



ref.).— Walcott, Amer. Jour. Sci., 4th ser., 3, 1897, p. 404. 

 Obolus (Lingulella) maera Walcott, Mon. U. S. Geol. Surv., 32, pt. 2, 1899, p. 443 



(gen. ref.). 

 Obolus maera Walcott, Moa. U. S. Geol. Surv., No. 51, 1912, p. 399, pi. 10, figs. 



2, 2a-e. 

 Upper Cambrian or Lower Ordovician (Pogonip): Roundtop Mountain, Eureka 



District, Eureka County, Nevada; Garfield County, Colorado. Also Upper 



and Middle Cambrian of Nevada. 



Obolus matinalis (Hall). 



Orbicula prima Owen, Rep. Geol. Surv. Wisconsin, Iowa, and Minnesota, 1852, 



p. 583, pi. IB, figs. 13 and 16-19. 

 Lingulepis pinnaformis Hall (not Owen), 16th Ann. Rep. New York State Cab. 



Nat. Hi3t., 1863, p. 129, pi. 6, figs. 12, 13 (not figs. 14-16); Trans. Albany 



Inst., 5, 1867, p. 107, pi. 1, figs. 12 and 13 (not figs. 14-16). 

 Lingulepis matinalis Hall, 16th Ann. Rep. New York State Cab. Nat. Hist., 1863, 



p. 130, pi. 6, figs. 12-13; Trans. Albany Inst., 5, 1867, p. 107, pi. 1, figs. 12 



and 13 (not fig. 15). 

 Lingulella? matinalis Walcott, Amer. Jour. Sci., 4th ser., 3, 1897, p. 404 (gen. 



ref.). 

 Obolus (Lingulella) matinalis Walcott, Mon. U. S. Geol. Surv., 32, pt. 2, 1899, 



p. 443 (gen. ref.). 

 Obolus matinalis Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 400, pi. 8, figs. 



1, la-k. 

 Lower Ordovician: Near Manitou, El Paso County, Colorado. Also Upper and 



Middle Cambrian of Wyoming, Minnesota, Montana, etc. 

 Plesioty pes. —Cat. Nos. 51563, 51564, etc., U.S.N.M. 



Obolus mcconnelll pellas (Walcott). 



Obolus (Lingulella) pelias Walcott, Proc. U. S. Nat. Mus., 28, 1905, p. 330. 

 Obolus mcconnelli pelias Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 398, pi. 22, 



figs. 3b, 3c; pi. 39, figs. 5, 5a-c. 

 Middle Cambrian to Lower Ordovician: Various localities in Utah and Nevada. 

 Holotype and paralypes. — Cat. No. 51592, U.S.N.M. 



Obolus mollisonensis Walcott. 



Obolus mollisonensis Walcott, Smiths. Misc. Coll., 57, 1912, p. 231, pi. 35, 



figs. 10-12. 

 Lower Ordovician (Goodsir): West side Moose Creek Valley, Mount Mollieon, 



British Columbia. 



Obolus? murrayl Billings. 



Obolus? murrayi Billings, Geol. Surv. Canada, Pal. Fossils, 1, 1865, p. 362.— 



Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 405, pi. 15, fig. 12. 

 Canadian(?): Maiden Arm, Hare Bay, east side of northern point of Newfoundland. 



