Smith.] "^^O [Oct. 2, 



Carboniferous of New Mexico, and in the Lower Carboniferous of Cali- 

 fornia. Dr. C. A. White* mentions a small Orthis, similar to this 

 species, from the Keokuk of Iowa and Illinois. In the Boone Chert, 

 Lower Carboniferous, of northern Arkansas, probably Keokuk, was 

 also noticed a small Orthis of this type, but the preservation was not 

 good enotigh for the identification to be certain. 



Oi'tJds conf. resuplnoides Cox, Geol. Siirv. Kentucky, Vol. iii, p. .570, PL 

 ix. Fig. 1 ; C. A. White, U. 8. Geog. Survey West of 100th Merid., 

 Vol. iii. Appendix, p. 23, PI. iii. Fig. 2. 



This type of Orthis is exceedingly rare in the Carboniferous, being 

 rather characteristic of the Devonian. 0. i^esiqnnoides is found in the 

 Coal Measures of Kentttcky and the Upper Carboniferous of New Mexico. 

 Dr. C. A. White compares the species to Orthis iowensis Hall, 0. tul- 

 liensis Vanuxem and 0. •propinqua Hall of the Devonian. 



A few poorly preserved specimens were found in White county, 8 N , 

 7 W., section 33, southeast quarter, east half, in the Lower Coal Meas- 

 Tires ; also in Conway county, 8 N., 17 W., section 33, northeast qitarter 

 of northeast ciuarter. 



Genus Dekbyia, Waagen. Derbyla crassa Meek and Haydeu. Orthi- 

 sina crassa M. and H , Proc Ac. Nat. Sci. Phil., 1858, p. 260. 

 Streptorhynchus crussus M. and H., F. B. Meek, U. S. Geol. Surv. 

 Nebraska, p. 174. Derbyia crassa M. and H., Waagan, Salt Itange 

 Fossils, Brachiopodu, p. 592. 



This species is widelj" distribttted in the Coal Measures of Kansas, 

 Nebraska, Illinois, Texas, etc., and was fotiud in the Upper Coal Meas- 

 ures of Poteau mountain, Indian Territory, and in the Lower Coal 

 Measures of Conway county, Arkansas, 6 N., 16 W., section 29, south- 

 west quarter of southwest quarter. It is also very common in the Lower 

 Carboniferous of the Mississippi valley. 



Genus Productus, Sowerby. Productus cora d'Orbigny, Puleont. de 

 I'Amer. Merid., 1842, p. 48. P. cora d'Orbigny, C. A. White, Geol. 

 Survey Indiana, 1883, p. 126, PI. xxvi. Fig. 1, 2, 3, ^P. prattenianus 

 Norwood. 

 This species is almost world-wide in its distribution in the Coal Meas- 

 ures, and is also found in the Productus Limestone of the Salt Range, 

 India. Waagen, in Paleontologia Indica, Salt Range Fossils, Brachio- 

 poda, p. 677, says that the true Productus cora is probably not found in 

 Europe, its nearest representative being P. riparius Trantschold. 



In America the typical species is very common in both Coal Measures 

 and Lower Carboniferous. It was found in tlic former liori/.on on 

 Poteau mountain, Indian Territory, and in the latter in numerous 

 places; Fayetteville shale, probably Warsaw, Independence county, 13 



* U. S. Oeoj. Surveii W. of lOOtli Merid., iv, p. 126. 



