442 CARBONIFEROUS FORMATIONS AND FAtJNAS OF COLORADO. 



LEDA Sehiiiuachcr, 1x17. 

 Lkjia ijkllistriata Stevens^ 



1858. LedaheUUrUila. SU'vens, Am. .lour. Sci., (2), veil. 2h, \>. 2(11. 



Coal Mea.surc.«; Daiivillf, III.; Suininit, Ohio. 

 IS.'SS. Nucnia {Leda) Icazuni'iinis. Swallow, Acad. Sci. St. I-ouIh, Trann., vol. 1, ]i. 190. (Not A'. 

 kazenensix Verneuil, 1845). 



Upper and Lower Permian: Valley of Cottonwood and near Sin<ik\- Hill Fork, Kan.sas. 

 18.58. Lcda hdUstrkiUi . Hall, Geol. Snrv. Iowa, vol, 1, pt. 2, p. 717. jil. 29, [\^>t. (>a-<l. 



Lower Coal Measures: Ulinoia. 

 18(!2. Leda heUislriata. Winchell, Acad. Nat. Sci. I'liiladelphia, I'roc, ]>. 419. 



Marshall grou]): jMoscow, Mich. 

 18(i5. Lcda helfistriat((. Winchell, Acad. Nat. Sci. Philadelphia, Proc, p. 12S. 



Marshall group: Hillsdale, Mich. 

 1860. Nucula kazanensiit. Geinitz, Carb. und Dyas in Nebraska, p. 2(.), \>\. 1, tigs. 33, 34. 

 181)9. LedahelUstnataf Wmchell, Safford's Geol. Tennessee, ji. 444. 



Shales just above Black Shale: Hickman and Maury counties, Tenn. 

 1870. Leda belli strkita^ Winchell, Am. Phil. Soc, Proc, vol. 11, p. 256. 



Waverly group: Tennessee. 

 1884. Nuculana belliMriata. White, Geol. Surv. Indiana, 13t.h Rept., p. 146, pi. 31, figs. 8, 9. 



Coal Measures: Vermilion, Sullivan, Vanderburg, and AVarrick counties, Ind. 



1887. Nuculana bellittriaia. Herrick, Sci. Lab. Denison Univ., Bull., vol. 2, p. 40, pi. 4, fig. 26. 

 Coal Measures: Flint Ridge, Ohio. 



1888. Nuculana belUslnata. Keye.s, Acad. Nat. Sci. Philadelphia, Proc, p. 232. 

 Lower Coal Measures: Des Moines, Iowa. 



1895. Nuculana bellktriala. Keyes, Missouri Geol. Surv., vol. 5, p.. 122, p\. 45, figs. 4a, 1). (Date of 



imprint, 1894. ) 

 LTpper Coal Measures: Gentry and Kansas City, Mo. 



1896. Nucul.ana3.it. bellistriaia. Smith, Leland Stanford Junior Univ. Publ.; Cont. to Biol. Hopkins 



Seaside Lab., No. 9, p. .35. 



Upper Coal Measures: Scott County, Ark. 

 1896. Nuculana aff. bellistriata. Smith, Am. Phil. Soc, Proc, vol. 35, p. 245. 



Upper Coal Measures: Scott County, Ark. 

 1900. Nuculana bellistriata. Beede, Univ. Geol. Surv. Kansas, Kept., vol. 6, p. 148, pi. 20, figs. 14, 141j. 



Upper Coal Measures: Kansas City, Rosedale, Lawrence, Topeka, Kans. 



Two specimen.s from .station 2219 in the San Juan region belong to the genus 

 JVuculoMa, but as they appear in the shape of internal casts an exact specilic identifi- 

 cation is impossible. I have referred them to our common Coal Measures species, 

 with which their general configuration accords. 



Locality and liorizon. — San Juan region (station 2219); upper portion of the 

 Hermo.sa formation. 



