DESCBIPTIONS OF SPECIES. 443 



MACRODON Lycett, 1846. 

 Macrodon obsoletus Meek. 



1871. Macrodon obsoletus. Meek, Eept. Regents Univ. West Virginia. 

 Lower Coal Measures: Monongahela County, W. Va. 



187.5. Macrodon obsoletus. Meek, Pal. Ohio, vol. 2, p. 334, pi. 19, fig. 9. 



Coal Measures: Newark, Ohio. 

 1886. Macrodon obsoletus. Heilprin, 2d Geol, Surv. Pennsylvania, Ann. Rejit. for 1885, p. 456, fig. 19. 



Upper Coal Measures: Mill Creek limestone, AVilkesbarre, Pa. 



1886. Macrodon obsoletus. Heilprin, Proc. and Coll. Wyoming Hist, and Geol. See, voi. 2, pt. 2, 



p. 275, fig. 19. 

 Upper Coal Measure.s: Mill Creek limestone, AA'ilkesbarre, Pa. 



1887. Macrodon obsoletu.i. Herrick, Sci. Lab. Denison Univ., Bull., vol. 2, p. 31, pi. 4, fig. 19. 

 Coal Measures: Flint Ridge, Ohio. 



1891. Macrodon obsoletus. Keyes, Acad. Nat. Sci. Philadelphia, Proc, p. 249. 

 Lower Coal Measures: Des Moines, Iowa. 



1895. Macrodon obsoletus. Keyes, Missouri Geol. Surv., p. 120, pi. 46, fig. 1. (Date of imprint, 1894.) 

 Upper Coal Pleasures: Kansas City, Mo. 



1896. Macrodon obsoletus. Smith, Leland Stanford Junior Univ. Publ.; Cont. Biol. Hopkins Seaside 



Lab., No. 9, p. .34. 



Upper Coal Measures: Sebastian County, Ark.; Poteau Mountain, Indian Territory. 

 1896. Macrodon obsoletus. Smith, Am. Phil. Soc, Proc, vol. 35, p. 244. 



Upper Coal Measures: Sebastian County, Xrk.; Poteau Mountain, Indian Territory. 

 1900. Macrodon obsoletus. Beede, Univ. Geol. Surv. Kansa.s, Kept., vol. 6, p. 147, pi. 20, fig. 13. 



Upper Coal Measures: Olathe, Turner, Lawrence, Kans. 



This species is represented l)y three specimens from one locality in the Leadville 

 I'egion. The identification is the same as that recorded in the LeadviUe monograph." 



Locality and horizoti. — Leadville district (station 2275); upper portion of the 

 Weber formation. 



Macrodon tenuistriatus Meek and Worthen? 



1866. Area striaia. Geinitz, Carb. und Pyas in Nebraska, p. 20, tab. 1, fig. 32. (t^! ot Mytilites striata 

 Schlath., 1817.) 



Upper Coal Measures: Nebraska City, Nebr. 

 1866. Macrodon tenuistriata. Meek and Worthen, Chicago Acad. Sci., Proc, vol. 1, p. 17. 



Upper Coal Measures: Springfield, 111. 



1872. Macrodon tenuistriata. Meek, U. S. Geol. Surv. Nebraska, p. 207, pi. 10, figs. 20a, b. 

 Ui)per Coal Measures: Nebraska City, Nebr.; Springfield, 111.; Iowa. 



Lower Coal Measures: Illinois. 



1873. Macrodon tenuistriatus. Meek and Worthen, Geol. Surv. Illinois, Kept., vol. 5, p. 576, pi. 26, 



fig. 4. 

 Upper Coal Measures: Springfield, 111. 



"U. S. Geol. Surv., Mon., vol. 12, 1886, p. 70. 



