BIBLIOGKAPHIC LIST OF GENERA AND SPECIES. 475 



ELKANIA Ford. Genotype: Obolclla desiderata Billings. 



Billingeia Ford (not Dekoninck, 1876), Amer. Jour. Sci., 3d ser., 31, 1885, p. 4C6. 



Elkania Ford, Amer. Jour. Sci., 3d ser., 32, 18SG, p. 325. Miller, N. A. Geol. 

 Pal., 1889, p. 346. Hall and Clarke, Pal. New York, 8, pt. 1, 1892, pp. 75, 

 165; llth Ann. Rep. New York State Geologist, 1894, p. 241. Walcott, Proc. 

 U. S. Nat. Mus., 28, 1905, p. 321. 



Elkania ambigua (Walcott). 



Obolella? ambigua Walcott, Mon. U. S. Geol. Surv., 8, 1884, p. 67, pi. 1, fig. 2. 



Billingsia? ambigua Ford, Amer. Jour. Sci., 3d ser., 31, 1886, p. 467. 



Elkania ambigua Ford, Amer. Jour. Sci., 32, 1886, p. 325. Hall and Clarke, Pal. 



New York, 8, pt. 1, 1892, p. 78. Walcott, Mon. U. S. Geol. Surv., 51, 1912, 



p. 562, pi. 51, figs. 2, 2a-c. 

 Lower Pogonip: Nortlieast of Adams Hill and southeast of Jackson Mine, Eureka 



District, Eureka County, Nevada. 

 Holotype and plesiotype.C&t. No. 24554, U.S.N.M. 



Elkania desiderata (Billings). 



Obolella desiderata Billings, Pal. Fossils, 1, Geol. Surv. Canada, 1862, p. 69, fig. 

 62 on p. 68. Davidson, Geol. Mag., 5, p. 309, figs. 1, 2. Walcott, Bull. U. S. 

 Geol. Surv., 30, p. 111. 



Billingsia desiderata Ford, Amer. Jour. Sci., 3d ser., 31, 1886, p. 466, figs. 1, 2. 



Elkania desiderata Ford, Amer. Jour. Sci., 32, 1886, p. 325. Hall and Clarke, 

 Pal. New York, 8, pt. 1, 1892, p. 77, pi. 3, figs. 15-19; llth Ann. Rep. State 

 Geol. New York, 1892, pi. 3, figs. 13-14. Schuchert, Bull. U. S. Geol. Surv., 

 87, 1897, p. 221. Walcott, Mon. U. S. Geol. Surv., 51, 1912, p. 562, pi. 51, 

 figs. 1, la-d. 



Canadian (Levis, Didymograptus zone): Point Levis, Quebec. 



Elkania Ida (Billings). 



Obolella ida Billings, Pal. Fossils, Geol. Surv. Canada, 1, 1865, p. 71, fig. 63 



(adv. sheets, 1862.) Walcott, Bull. U. S. Geol. Surv., 30, 1886, p. 111. 



Dawson, Canadian Rec. 



Sci., 3, 1888, p. 55; Peter Redpath Mus., McGill Univ., 1888, p. 55. 

 Billingsia? ida Ford, Amer. Jour. Sci., 3d ser., 31, 1886, p. 467. 

 Elkania ida Ford, Amer. Jour. Sci., 32, 1886, p. 325 (gen. ref.). Walcott, Mon. 



U. S. Geol. Surv., 51, 1912, p. 563, pi. 30, figs. 20, 20a; pi. 51, figs. 4, 4a~c. 

 Ozarkian? (Levis-erratics) : Point Levis, Quebec. 



ELKANIA PRETIOSA Ford. See Acrothete pretiosa. 



ELLIPTOCEPHALA UNDULOSTRIATA Miller. See Proetus undulostriatus. 



ELPE Barrande. Genotype: E. inchoata Barrande. 



Elpe Barrande, Syst. Sil. du Centre Boheme, 1, Suppl., 1872, p. 510. Zittel, 



Handb. Pal., 2, 1885, p. 554. Ulrich, Zittel-Eastman Textb. Pal., 1, 1900, 



p. 646. Bassler, ibid, 2d ed., 1913, p. 741. 

 Leioditia (Ulrich MS.) Jones, Geol. Surv. Canada, Cont. Micro-Pal., 3, 1891, p. 94. 



Elpe cincinnatiensis (Meek). 



Cythere Cincinnatiensis Meek, Proc. Acad. Nat. Sci. Philadelphia, 1872, p. 331; 

 Geol. Surv. Ohio, Pal., 1, 1873, p. 158, pi. 14, figs, la-d. Miller, Cincinnati 

 Quart. Jour. Sci., 1, 1874, p. 120. Jones, Ann. Mag. Nat. Hist., 5th ser., 14, 

 1884, p. 395, footnote. 



Cytheropsis cincinnatiensis Miller, N. A. Geol. Pal., 1889, p. 541, fig. 993. 



Maysville (Corryville): Cincinnati, Ohio, and vicinity. 



