DESCRIPTIONS OF SPECIES. 403 



Mountain region, Yampa plateau (station 2330); middle division of the Carboniferous. 

 Grand River region, Glenwood Springs (station 2329b). 



SEMINULA McCoy, 1844, emend. Hall and Clarke, 1893. . 

 Seminula subtilita Hall. 

 PI. VII, figs. 1 to lb, 2, 2a, 3, 3a, 4-7, 7a, 8-10. 



18-42. Terehratula roissyi. D'Orbigny (non L'EveilW) , Voyage dans I'AmeriqueMeridionale, Pal., p. 46. 



Carboniferous: Yarbichambi. 

 1852. Tcrehraiula plario-sulcata. Owen, Geol. Surv. Wisconsin, Iowa, and Minnesota, pi. 5, fig. 9. 



Carboniferous limestone: Near Council Bluffs. 

 1852. Terehratula guhtilita. Hall, Stansbury's Exped. Great Salt Lake, p. 409, pi. 2, figs, la, b, 2a, b. 



Carboniferous: iMissouri Kiver, near Weston. 

 ?1853. Terehratula suhiiliia. Shumard, jNIarcy's Expl. Ked River of Louisiana, Thirty-second Congress, 

 Second session, Senate Doc. No. 54 (reprinted several times with different pagination), p. 202, 

 pi. 4, fig. 8. 



Carboniferous: Washington County, Ark. 



1855. Terehratula mhtilita. Schiel, Pacific Kailroad Rept., vol. 2, p. 108, pi. 1, figs. 2a, b. 

 Carboniferous limestone: 8 miles west of Westport. 



1856. Terehratula subtilita. Hall, Pacific Railroad Rept. vol. 3, p. 101, pi. 2, figs. 3-5. 

 Carboniferous: Pecos Village, N, Mex. 



1857. Terehratula (?) .mhtilita. Davidson, Mon. British Oarb. Brach., Pal. Soc, p. 18, pi. 1, figs. 21, 22. 

 Carboniferous: Mayen Wais, England. 



1858. Terehratula plano-sulcata. Marcou, Geol. North America, p. 52, pi. 6, figs 8, 8b. 

 Mountain limestone: Tigeras, N. Mex.; Ohio; Indiana; Illinois; Kentucky; Arkansas. 



1858. Terehratula roysii. Marcou, Geol. North America, p. 51, pi. 6, figs. 10, 10b. 



Mountain limestone: Salt Lake City, Utah; El Paso, Chihuahua; headwaters of the Rio Colo- 

 rado Chiquito. 

 1858. Terehratula suhtilita. Mai'cou, Geol. North America, p. 52, pi. 6, figs. 9-9f. 



Mountain limestone: Sierra Madre; Sierra de Magoyon; Great Salt Lake; Tigeras and Pecos 

 Village, N. Mex.; summit of Sierra de Sandia and Sierra de Magoyon; El Paso, Chihuahua; 

 junction of rivers San Pedro and Gila, Arizona; sources of Rio Colorado Chiquito; Shasta 

 County, Cal.; Vancouver Island. 



1858. Terehratula suhtilita. Hall, Geol. Surv. Iowa, vol. 1, pt. 2, p. 714. 



Coal Measures: Ohio; Indiana; Illinois; Iowa; Missouri; Kansas; Nebraska; and Pecos Village, 

 N. Mex. 



1859. Spirigera subtilita. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 28. 

 Upper Coal Measures: Kansas. 



1860. Athyris mhtilita. .Davidson, Mon. British Carb. Brach., Pal. Soc, p. 86, pi. 1, figs. 21, 22; pi. 



17, figs. 8-10. 

 Carboniferous: Mayen W^ais, England; Tournay, Belgium. 



1861. Athyris suhtilita. Salter, Geol. Soc. London, Quart. Jour., vol. 17, p. 64, pi. 4, fig. 4. 

 Carboniferous: Isthmus of Copacabana, in the Lake of Titicaca. 



1861. Athyris suhtilita. Newberry, Ives's Colorado River Expl. Exped., p. 126. 



Upper Carboniferous: Cherty limestone on banks of Colorado between Little Colorado and 

 Diamond rivers; Pecos Village, east of Santa Fe. 



