1896.] ^4J [Smith. 



Subclass Oastro'poda. 



Genus Bellerophon. Bellerophon carhonarhis Cox, Geol. Surv. Ken- 

 tucky, Vol. iii, p. 574, PI. x. Fig. 2. B. urii C. R. Keyes, Proc. Ac. 



Nat. 8c. Phila., July 31, 1888, p. 14. 



In the Lower Coal Measures of Conway county. Ark., 5 N., 16 W., 

 section 17, centre of north half, were found specimens of this charac- 

 teristic Coal Measure species, but poorly preserved. Better ones were 

 found in the Lower Coal Measures of Conway county, 6 N., 16 W., sec- 

 tion 29, southwest quarter of southwest quarter. 



BelleropJion crassus Meek and Worthen, Geol. Surv. Illinois, ii, p. 385, 

 PI. xxxi. Fig. 16. 



This species is found in the Upper and Lower Coal Measures of In- 

 diana, in the Subcarboniferous and the Coal Measures of Pennsylvania, 

 and the Upper Carboniferous limestone of Nevada, etc. Good speci- 

 mens of it were found in the Lower Coal Measures of Conway county. 

 Ark., 5 N., 16 W., section 17, centre of the north half 



Bellerophon marcouanus Geinitz, Carbon, u. Dyas in Nebraska, p. 7. 



This species in the Upper Coal Measures of Kansas, Nebraska and 

 Iowa, in the Coal Measures of Illinois and West Virginia, and was found 

 in the Upper Coal Measures of Sebastian county. Ark., in 8 N., 32 W., 

 section 12. 



Bellero-phon sp. 



In the Lower Coal Measures of White county, 8 N., 7 W., section 33, 

 southeast quarter, and section 26, southeast quarter in the massive 

 sandstone, were found several large imperfect specimens of a Bellero- 

 phon that resembles B. crassus, but it is probably a diflerent species ; it 

 is too imperfectly known for specific identification and description. 



Genus Pleukotomaria, Defrance. Pleurotomaria modesta Keyes, Proe. 

 Ac. Nat. 8c. Phila., 1888> p. 238, PI. xii, Fig. 2. P. depressa Cox, 

 Geol. 8urv. Kentucky, iii, p. 569, PI. viii, Fig. 10. 



A single specimen of this exceedingly delicate and beautiful species, 

 showing all the markings, was found in the Upper Coal Measures of 

 Crawford county, Ark., 10 N.. 30 W., section 10, southeast quarter. 



Pleurotomaria conf speciosa. Meek and Worthen, I^'oc. Ac. Nat. 8ei. 



Phila., 1860, p. 459; Geol. Surv. Illinois, Vol. ii, p. 352, PL xxviii. 



Fig. 5. 

 One small imperfect specimen from the Upper Coal Measures of Po- 

 teau mountain, Indian Territory, shows the characters of the Illinois 

 species, although very much smaller. The well-defined suture and fine 

 ornamentations are similar on both and serve to make their identity 

 probable. 



PROC. AMER. PHILOS. SOC, XXXV. 152. 2 F. PRIXTED DEC. 9, 1896. 



