251 



[Smith. 



Illinois to Nevada ; it was found in the Upper Coal Measures of Sebas- 

 tian county, Ark., 8 N., 33 W., section 12, associated with numerous 

 otlier fossils characteristic of tlie same horizon. 



Nntkopsis sp. 



In the Upper Coal Measures of Scott county. Ark., 1 N., 28 W., sec- 

 tion 4, southeast quarter of southeast quarter, was found a specimen of 

 Natiropsis that resembles somewhat N. slmmardi McChesney, found by 

 Dr. White in the Permian of Texas, Bull. 77, IT. S. Geol. Sun., p. 24, 

 PL iii, Fig. 11, but it is too imperfect to justify a reference to this species. 



Genus Macrocheilus, Phillips. MacrocTieilus conf fusiformis Hall, 

 Geol. Surr. Lma, i, Part ii, p. 718, PL xxix; Fig. 7. 



In the ferruginous slialc of the Lower Coal Measures of Conway 

 county, Ark., 5 X., 16 W., section 17, centre of the north half, were 

 found a few specimens that probably belong to Hall's Coal Measure 

 species. 



MacrocJu'ilus (Solcniseus) primigenius Conrad, Hall, Geol. Sui'v. lotca, 

 Vol. i. Part ii, p. 720, PL xxix. Fig. 11. 



This species is widelj^ distributed in the Coal Measures of the Missis- 

 sippi Valley states, and was also found in the Lower Coal Measures, in 

 Conway county. Ark., 5 IS"., 16 W., section 17, centre of the north half. 



Genus Polyphemopsis, Portlock. Polyphemopsis inornata Meek and 

 Worthen, sp. Loxonema inornata Meek and Worthen, Proc. Ac. 

 Nat. Sc. PMla., 1860, p. 463. Polyphemopsis inornata M. and W., 

 Geol. Surv. Illinois, li, p. 374, PL xxxi, Fig. 8. 



This species, originally described from the Upper Coal Measures of 

 Illinois, was found in the same horizon in Crawford county. Ark., 10 

 N., 30 W., section 10, southeast quarter of northwest quarter. 



Subclass Pteropoda. 



Genus Conularia, Miller (Sowerby). Conularia conf . cj'ustulaWhite, 

 XII Am. Rep. U. S: Geol. and Geog. Surv. of Terr., 1878, p. 170, 

 PL xlii. Fig. 4; U. S. Expl. W. of 100th Merid.. iii, Appendi.x, p. 

 28, PL iii, Fig. 4. 



The genus Conularia is not common in the Lower Carboniferous, but 

 is exceedingly rare in the Coal Measures, so much so that Dr. White 

 mentions this species as being the only representative in that series. 

 Dr. White found it in the'Coal Measures near Kansas City, and also 

 near Taos, N". M. The species has been found in the Coal Measures 

 of Texas, and also in the Coal Measures of Scott county, Ark., 1 N., 

 28 W., section 4, southeast quarter of southeast cpiarter. 



