304 CARBONIFEROUS FORMATIONS AND FAUNAS OF COLORADO. 



The dorsal valve, of which a tigurc is given on PI. Ill, fig. '.), in the nodulose 

 surface ornamentation presents a character not found in the species above mentioned, 

 but this example shows mainly the inner surface of the shell. 



LoeiiVify (tnd horizon. — San .luan region (stiition 2214); base of Hermosa forma- 

 tion. Leadville district (station 2259). 



Prodtjctus CORA d'Orblguy. 



PI. IV, ligs. 1-lb, 2-2a, 3-'3a, 4-4b. 



1842. Prodacttis cora. D'Orbigny, Voyage dans rAmerique M^ridionale, Pal., p. 55, p). 5, figs. 8-10. 

 Carboniferous: Above Patapatani, on an island in Lake Titicaca; Yarbichambi. 



1845. Prodnctiis lyelli. De Verneuil, Lyell's Travels in North America, vol. 2, p. 221. 



Mountain limestone: Windsor, Horlon Bluff, Shubenacadie, Gays Kiver, Debert River, Minudie, 

 and Cape Breton. 



1847. Productus cora. De Koninck, Soc. Roy. d. Sci. Li^ge, M^m., vol. 4, p. 148, pi. 4, fig. 4, a, b; 

 pi. 5, fig. 2, a, b, c, d. 

 Lower Carboniferous limestone of Vis6, of Chokier, and of Ratingen; in the shales of the 

 median etage near Tournay, and in the Upper Carboniferous slates of Epinoy near Binche 

 (Hainaut) ; banks of the Missouri; Kendal, Westmoreland; Lowick; Yorkshire; Derbyshire; 

 Ireland; banks of the Wilji, an affluent of the Taroussa; on the banks of the Louja in the 

 district of Medynsk, province of Kalouga; beyond Cosatchi-Datchi on the eastern side of the 

 Urals, near Sterlitamack, between Perm and Serebriansk; on the west side of the same chain 

 from Kachira on the Oka, and from Unja near Kosimof ; Flint Ridge, Zanesville, Guernsey 

 County (Ohio); between New Harmony and Mount Vernon (Indiana); Windsor (Nova Scotia); 

 Leavenworth, Ind.; on the Bolivian plateau, above Patapatani; in one of the islands of Lake 

 Titicaca, and at Yarbichambi, South America. 



1847. Productacora. De Koninck, Recherches sur les Animaux Fossiles, pt. 1, p. 50, pi. 4, figs. 4a, b; 



pi. 5, figs. 2a-d. 

 Carboniferous: Guernsey County, Flint Ridge, and Zanesville, Ohio; between New Harmony 

 and Mount Vernon, Ind.; Leavenworth, Ind.; Windsor, Nova Scotia; Bolivia, etc.. South 

 America. 



1848. Productus martini. Christy, Letters on Geology, pi. 5, figs. 6, 8, 9. 

 [Carboniferous]: Pinckueyville, 111. 



1848. Productus sp. Christy, Letters on Geology, pi. 5, fig. 1. 



Sandstone above the Black shale. Elk River, Tennessee. 

 1852. Productus semireticulatus. Hall, Stansbury's Exped. Great Salt Lake, p. 411, pi. 3, figs. 3, 5a, b. 



Carboniferous: Near Fort Laramie; and Flat Rock Point and other places in the neighborhood 

 of Great Salt Lake. 

 1852. Productus cora. Owen, Geol. Surv. Wisconsin, Iowa, and Minnesota, pp. 103, 136, pi. 5, fig. 1. 



Carboniferous; Missouri River, below mouth of Little Platte River. 

 1852. Productus cora. Roemer, Kreid. von Texas, p. 90. 



Carboniferous: San Saba Valley, Texas. 

 1854. Productus cora. Marcy's Expl. Red River of Louisiana, p. 176. 



Carboniferous: Washington and Crawford counties, .\rk. 



