I'SO CARBONIFEKOUS FORMATIONS AND FAUNAS OF OOLOKADO. 



Ill a disiussidii of t'h. Ifigariensw l)iisc(l u|)i)ii specimen.s from the Madi.son lime- 

 stone of Yellowstone Park. I called attention to the almost exact correspondence 

 between that species and one whicli had previousl}- bcvn describod under the name 

 of Cli. HHiioi.si'nKix. but nevertheless retained Hall and AVhitticld's name. 1 had 

 not, nor have I now, any doubt of the identity of these two species, and have here 

 delinitely thrown into synonymy the name proposed for the Utah representatives. 



The material from Colorado, though not very plentiful or well pi-eserved, is 

 referred to this species with considerable confidence. 



Locality and hm'izan. — San Juan region (stations 2379, 2381); Ouray limestone. 



PRODUCTELLA Hall, 1867. 

 Productella concentrica Hall. 



1857. Productus concerdricus. Hall, New York State Cab. Nat. Hist., 10th Kept., p. 180. 

 Chemung sandstone: Burlington, Iowa. 



1858. Fivductus shumardkinas (pars). Hall, Geol. Surv. Iowa, vol. 1, pt. 2, p. 499, pi. 7, fig. 1 (not 



pi. 3, flg. 9). 



Chemung group: Burlington, Iowa. • 



1858. Productus concentrk-us. Hall, Geol. Surv., Iowa, vol. 1, pt. 2, p. 517, pi. 7, fig. 3. 



Chemung group: Burlington, Iowa. 

 1860. Productus coopetenm. Swallow', Acad. Sci. St. Louis, Trans., vol. 1, p. 640. 



Chouteau limestone: Cooper County, Mo. 

 1862. Producta concentrica. Winchell, Acad. Nat. Sci. Philadelphia, Proc, p. 411. 



Marshall group: Pointe Aux Barques, Mich. 

 1865. Producta concentrica. Winchell, Acad. Nat. Sci. Philadelphia, Proc, p. 114. 



^larshall group: Northern and southern Michigan; Burlington, Iowa; Eockford, lud. 

 1865. Producta cooperenns. "Winchell, Acad. Nat. Sci. Philadelphia, Proc, p. 115 (not "Winchell, 1870). 



Bed No. 1: Burlington, Iowa. 



1869. Producta concentrica. W^inchell, Safford's Geol. Tennessee, p. 443. 

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



1870. Producta concentric. Winchell, Am. Phil. Soc, Proc, vol. 11, p. 249. 

 ATaverly group: Tennessee; Scioto ville, Ohio. 



1883. ProducteUa shumardiana. Hall, Kept. New York State Geol. for 1882, pi. (17) 48, fig. 7. 



Sandstone: Burlington, Iowa. 

 1888. Productus concentricas. Herrick, Sci. Lab. Denison Vniv., Bull., vol. 3, p. 33, pi. 6, fig. 16. 



AVaverly group: Licking County, Ohio. 

 1888. Productus {Productella) shumardianus. Herrick, Sci. Lab. Denison Univ., Bull., vol. 3, p. 32, pi. 

 7, fig. 18; pi. 12, figs. 6, 43. 



Waverly group: Licking County, Ohio. 

 1892. Productella ■shumardiana. Hall and Clarke, Pal. New York, vol. 8, pt. 1, pi. 17, fig. 7. 



Yellow sandstone: Burlington, Iowa. 

 1899. Productella concentrica 1 Weller, Acad. Sci. St. Louis, Trans., vol. 9, p. 17. 



Vermicular sandstone: Northview, Webster County, Mo. 



