DESCEIPTIONS OF SPBCIKS. 371 



1886. Prodkclui nebrascensisf Heilprin, 2d Geol. Surv. Pennsylvania, Ann. Kept, for 1885, p. 453, 

 fig. 4c; p. 440, figs. 4-4b. 

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



1886. Produdus nebrascensisf Heilprin, Proc. and Coll. Wyoming Hist, and Geol. Soc, vol. 2, pt. 2, 



p. 268, figs. 4, 4b. 

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



1887. Produdus nehrascenm. Herrick, Sci. Lab. Denison Univ., Bull., vol. 2, p. 49, pi.. 2, fig. 30. 

 Coal Measures: Flint Ridge, Ohio. 



1892. Produdus nebrascensis. Hall and Clarke, Int. Study of Brach., pt. 1, pi. 22, fig. 7. 



Coal Measures: Lasalle, 111. 

 1892. Produdus nehrascensis. Hall and Clarke, Pal. New York, vol. 8, pt. 1, pi. 19, figs. 5-7. 



Coal Measures: Lasalle, 111. 

 1895. Produdus nebrascensis. Keyes, Missouri Geol. Surv., vol.5, p. 48, pi. 37, figs. 3a-e. (Date of 

 imprint, 1894.) 



Upper Coal Measure.s: Kansas City, Mo. 

 1900. Produdus nebrascensis. Beede, Univ. Geol. Surv. Kansas, Kept., vol. 6, p. 84, pi. 9, figs. 7-7f. 



Upper Coal Measures: Kansas City, Turner, Eudoia, Lawrence, Lecompton, Topeka, Man- 

 hattan, and Grand Summit, Kans. 



In our collections the representation of this species is practically confined to the 

 Durango quadrangle and to the Leadville district. In these two areas it has been 

 found at a number of localities, and seems to be fairly abundant, though it is not 

 often well preserved, owing to the chai'acter of its surface ornamentation. Because 

 of the circumstance last mentioned, some of the identifications may possibly represent 

 specific afiinity, rather than strict specific identify. 



Herrick identifies with Prod/ucius nebraskensis certain shells from the Waverly 

 group in Licking County, Ohio." His figures represent at least two and possibly 

 three species, none of which is closely related to P. nebraskensis. The large form 

 shown on his pi. 1 is, I believe, a species which is rather abundant at Sciotoville, 

 Ohio. Meek described and figured it as Prochictvs sp.* Winchell probably referred 

 to it as Produchis cooperensisf S It is related to Produdus hlairi, but is probably 

 new. The name Produdus toinchelll is here proposed for it. 



The small form figured by Herrick on pi. 3 as Produdtis nebraskensis seems to 

 belong to the semireticulatus type, and is possibly related to P. wortheni. 



Locality and horizan.—SsLn Juan region (stations 2200, 2204, 2205, 2207, 2209, 

 2210, 2213, 2215, 2239, 2240, 2248?, 2333); lower, middle, and upper portions of the 

 Hermosa formation, and in the Rico formation. Leadville district (stations 2254?, 

 2267, 2268, 2271, 2281); base of the Weber formation. Ouray (station 2195b); Her- 

 mosa formation. 



<"Sci. Lab. Denison Univ., Bull., vol. 3, 1888, p. 31, pi. 1, flg. 24; pi. 3, figs. 25 (?), 26a. 

 6Geol. Surv. Ohio, Kept., vol. 2, pt. 2, 1875, p. 282, pi. 10, figs. 4a-4c. 

 cAm. Phil. Soc, Pioc, vol. 12, 1870, p. 249. 



