Smith.] ^^2 [Oct. 2, 



of Conway county, G X., IG W., section 29, sotithwcst quarter of south- 

 west quarter. 



Spirifer rocky montamis Marcou, Geol. of N. Amer., p. 50, PI. vii, Fig. 4. 

 Spirifer opima Hall, Oeol. Surv. Iowa, Yo]. i, Part ii, p. 711. Spir- 

 ifer suhventricosa McChesney, Besc. New Pal. Foss., p. 44. Spirifer 

 rockymontanus Marcou, C. A. White, JJ. S. G. Erpl. W. of 100th 

 Merid., iv, p. 134, PI. xi. Fig. 9. 



S. rockymontanus occurs in the Upper Carboniferous from Pennsylva- 

 nia to New Mexico. 



It was found in the Lower Coal Measures of White county, 8 N., 

 7 W., section 33, southeast quarter, in the form of well-preserved casts, 

 also in section 2G, on Bee Rock ; also in the same horizon, Crawford 

 county, 12 N., 30 W., section 17. These specimens agree with Dr. 

 White's figures and descriptions so well that no fitrther description is 

 necessary. 



Genus Spiriferina, d'Orbigny. Spiriferina cristata Schlotheim. Ter- 

 ebratulites eristatus Schlotheim, Beitrage Nut. Verst. Muenchen, 

 PL i. Fig. 3. Spiriferina kentuckensis Shumard, Oeol. Surv. Mis- 

 sotiri, 1858, p. 203. Spirifer octoplicatus Hall, Stansbury' s Expl. Gt. 

 Salt Lake, p. 409, PI. xi. Fig. 4. Spirifer laminosus Geinitz, Car- 

 bonformation und Byas in Nebraska, p. 45, PI. iii. Fig. 11. Spir- 

 iferina kentuckensis Shumard, sp., F. B. Meel^, U. S. Geol. Surv. 

 Nebraska, p. 185, PI. vi. Fig. 3, PI. viii. Fig. 11. 



Dr. C. A. AVliite. in U. S. Geog. Expl. W. of 100th Merid., iv, p. 140, 

 egards S. octoplicatus Hall and S. kentuckensis Shumard as distinct 

 species. C. D. Walcott, Pal. Eureka Bistrict, p. 218, regards them both, 

 as well as S. spinosa Norwood and Pratten, as synonyms of S. cristata 

 Schlotheim, sp. If this reference is correct, then the species ranges 

 from the Upper Devonian of the White Pine Mining district into the 

 Upper Carboniferous of the Eureka district. 



Davidson {Monograph Brit. Garb. Brach., p. 207) regards Spiriferina 

 octoplicata Sowerby, sp., as synonymous with S. cristata Schlotheim, sp., 

 which ranges from the Carboniferous into the Permian. Taken in these 

 broader limitations, the species ranges from the Devonian, through the 

 Lower Carboniferous of the West, and tlirough the entire Coal ]Meas- 

 ures from Kentucky to Nevada. 



Hall (Geol. Survey Iowa, Vol. i. Part ii, p. 706, PI. xxvii, Fig. 5) de- 

 scribes and figures Spiriferina spiiwsa N. and P. from tlie Kaskaskia 

 group of Iowa. He states that S. spinosa differs from *S. kentuckensis in 

 being more robust and in possessing the tubular spines. 



But specimens of S. kentuckensis from the Upper Coal Measures of 

 Arkansas are equally robust and possess the spines tliat are thought to 

 be characteristic of S. spinosa. 



A comparison of specimens from the Upper Coal Measures of Sdias- 



