4C8 OARBONIFEROirS FOKMATlONtf AND FAUNAS OF COLORADO. 



BELIJ^niOrilON Montfort, 1808, emend. Waaoc-ii, 188-i. 

 Bellerophon ckassus Meek and Wovthen. 



18()0. In'lkrophon crmmg. Meek und Worthen, Acad. Nat. Sri. Philadeliiliia, Proc, p. 458. 



Lower Coal Measures: J'ittsburg, St. Clair County, 111. 

 186t>. Bdkivphoii nxu^svs. Meek and Worthen, Geol. Surv. Illinois, Kept., vol. 2, p. 385, pi. 81, figs. 

 lOa, b. 



Lower Coal Measures: Pittsburg, St. Clair County, 111. 

 1875. Bellerophon crassus. White, U. S. Geog. Geol. Surv. W. 100th Mer., Rept., vol. 4, p. 157, i>l. 12, fig. 

 la. (Whole volume publislied in 1877. ) 



Carboniferous: Camp Cottonwood, near Spring Mountain, Nev. 

 1884. Bellerophon crassus. White, Geol. Surv. Indiana, 13th Rept., p. 157, pi. 33, figs. 1, 2. 



Upper Coal Measures: Sullivan and Posey counties, Ind. 

 1886. Bellerophon missus (var. )? Heilprin, 2d Geol. Surv. Pennsylvania, Ann. Rept. for 1885, p. 457. 



LTpper Coal Measures: Mill Creek limestone, Wilkesbarre, Pa. 



1886. Bellerophon crassus (var.)? Heilprin, Proc. and Coll. Wyoming Hist, and Geol. Soc, vol. 2, pt. 



2, p. 277. 

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



1887. Bellerophon (cf. crassus). — Herrick, Sci. Lab. Denison Univ., Bull., vol. 2, p. 20, pi. 5, fig. 6. 

 Coal Measures: Flint Ridge, Ohio. 



1891. Bellerophon crassus. White, U. S. Geol. Surv., Bull. No. 77, p. 26. 

 Permian: Military Crossing, Baylor County, Tex. 



1895. Bellerophon crassus. Keyes, Missouri Geol. Surv., vol. 5, p. 151, pi. 50, figs, la, b. (Date of 



imprint, 1894.) 

 Upper Coal Measures: Kansas City and Lexington, Mo. 



1896. Bellerophon cras.svs. Smith, Leland Stanford Junior Univ. Publ., Cent. Biol. Hopkins Seaside 



Lab., No. 9, p. 39. 

 Lower Coal Measures: Conway County, Ark. 



1896. Bellerophon crassus. Smith, Am. Phil. Soc., Proc, vol. 35, p. 249. 

 Lower Coal Measures: Conway County, Ark. 



1897. Bellerophon. crassus. Ulrich, Geol. Nat. Hist. Surv. Minnesota, Final Rept., vol. 3, pt. 2, p. 853. 

 Coal Measures. 



1899. Bellerophon crassus. Girty, U. S. Geol. Surv., Nineteenth Ann. Rept., pt. 3, p. 592. 



As almost all the specimens of this species occur in the form of internal casts, 

 it can scarcelj" be said that the identification suggested above is worthy of entire 

 reliance. At the same time they agree with .specimens of B. crassu.'i from the 

 Mississippi Valley similarljr preserved in all the characters of which their imperfect 

 condition permits recognition. It is not at all improbable, however, that among the 

 smaller shells referred to this species there are some which should be placed with 

 other groups, especially with Ettphemus. 



Locality and hori2on.—^2in Juan region (stations 2216, 2217, 2234?, 2340, 

 2341, 2342); middle and upper portions of the Hermosa formation and in the Eico 

 formation. Cre.sted Butte district (station 2293); Maroon formation. Leadville 



