DESCRIPTIONS OF SPECIES. 411 



imperfect and the other is not quite typical so that it can not be said to have been 

 certainly found in the State at all so far as our collections are concerned. 



Locality and Jim^izon. — San Juan region (station 2196c?); Hermosa formation. 

 Crested Butte district (stations 2245, 2280); Maroon formation. 



HUSTEDIA Hall and Clarke, 1893. 

 HusTEDiA MORMONi Marcou. 



PI. VII, flgs. 12, 12a, 13. 



1858 (February); Terehratula mormoni. Marcou, Geol. North America, p. 51, pi. 6, flgs. 11-lle. 



Mountain limestone: Salt Lake City, Utah. 

 1358 (June). Retzia punctUifera. Shumard, Acad. Sci. St. Louis, Trans., vol. 1, p. 220. 



Upper Coal Measures: Audrain and Howard counties. Mo.; below mouth of Platte Eiver, 

 Nebraska; near ^Manhattan, at Willowsprings, on Santa Fe road, and headwaters of Verdigris 

 River, Kansas. 



1859. Retzia mormoni. Meek and Hayden, Acad. Nat. Sci. Philadelphia, Proc, p. 27. 

 Upper Coal Measures: Manhattan and Leavenworth, Kans. 



1860. Retzia subglobosa. McChesney, Desc. New Spec. Pal. Foss., p. 45. 



Upper Coal Measures: Menard, Mason, Fulton, Peoria, Tazewell, Knox, and Marshall coun- 

 ties, 111. 



1864. Retzia compressa. Meek, Pal. California, vol. 1, p. 14, pi. 2, figs. 7-7c. 

 Carboniferous: Bass's Ranch, Shasta County, Cal. 



1865. Retzia suhglohosa. McChesney, Illustrations New Spec. Pal. Foss., pi. 1, fig. 1. 



1866. Retzia mormoni. Geinitz, Carb. und Dyas in Nebraska, p. 39, tab. 3, fig. 6. 

 Upper Coal Measures: Plattsmouth, Nebr. 



1868. Retzia punctulifera. McChesney, Chicago Acad. Sci., Trans., vol. 1, p. 32, pi. 1, figs. la-c. 



Upper Coal Measures limestone: Menard, Mason,. Fulton, Peoria, Tazewell, Knox, and Marshall 

 counties. 111. 

 1872. Retzia punctulifera. Meek, U. S. Geol. Surv. Nebraska, p. 181, pi. 1, fig. 13; pi. 5, fig. 7. 



Upper Coal Measures: Rock Bluff, Plattsmouth, and Nebraska City, Nebr. 



Coal Measures: Nebraska; Kansas; Illinois. 



1874. Eumetria jnmctulifera. Derby, Cornell Univ., (Science) Bull., vol. 1, No. 2, p. 4, pi. 8, figs. 



4, 5, 7, 8, 10; pi. 9, fig. 3. 

 Coal Measures: Bomjardim and Itaituba, Brazil, and Pichis River, Peru. 



1875. Retzia mormonii. White, U. S. Geog. Geol. Surv. W. 100th Mer., Rept, vol. 4, p. 141, pi. 10, 



figs. 7a-c. (Whole volume published in 1877.) 

 Carboniferous: Near Santa Fe, New Mex.; top of Grass Mountain, Ely Range, 30 miles north of 

 Pioche, Nev. 

 1875. Terehratula mormoni. Marcou, Acad. Sci. St. Louis, Trans., vol. 3, p. 252. 



1883. Retzia compressa. Kayser, Richthofen's China, vol. 4, p. 176, pi. 22, figs. 1-4. 

 Upper Carboniferous: Lo-Ping, China. 



1884. Retzia radialis. Walcott (non Phillips) (pars), U. S. Geol. Surv., Mon., vol. 8, p. 220, pi. 7, figs. 



5f-h (not figs. 5-5e). 

 Upper Carboniferous: Eureka district, Nevada. 



