254 POTTSVILLE FAUNA OP OHIO 



angle, while in the species under consideration it is on the flat vertical 

 zone between the carinae. The form is common in both the Harrison 

 and Sharon ores. A few external casts from the Lower Mercer lime- 

 stone of Muskingum County have also been referred with considerable 

 doubt to the same species. 



Horizon and locality. Harrison ore: Jackson County, Locality 1, 

 c. Sharon ore: Scioto County, Locality 2, c. Lower Mercer limestone: 

 Muskingum County, Locality 43, r. 



Pleurotomaria, several species 



Remarks. Internal casts of small gastropods, evidently of the 

 genus Pleurotomaria, are common in the Boggs limestone, but in the 

 absence of all surface markings specific determination is impossible. 

 Other small gastropods apparently belonging to the same genus and 

 in a similar condition of preservation are present in the Upper Mercer 

 member. Larger individuals, too poorly preserved for identification, 

 occur' in the Me Arthur limestone. 



Horizon and locality. Boggs limestone: Muskingum County, Lo- 

 cality 26, c. Upper Mercer member: Muskingum County, Locality 65, 

 r. Me Arthur member: Jackson County, Locality 80, r. 



Genus Phanerotrema Fischer de Waldheim 

 Phanerotrema grayvillense (Norwood and Pratten) 



1855 Pleurotomaria grayvillense. Norwood and Pratten, Jour. Acad. Nat. Sci. Phil., 

 2nd Ser., Vol. 3, p. 75, PI. 9, Figs. 7a, b. 



Coal Measures: Grayville. Illinois; near mouth of Rush Creek, Posey County, 

 Indiana; Shawneetown and Galatia, Illinois. 



Remarks. Pleurotomaria grayvillense is of rare occurrence in the 

 middle an'd upper Pottsville formation of this State. It is represented 

 in the collections studied by a few specimens in a fair state of preserva- 

 tion, on which the delicate surface markings are distinctly visible. 



Horizon and locality. Lower Mercer limestone: Perry County, 

 Locality 25, r; Stark County, Locality 52, r. McArthur limestone: 

 Jackson County, Locality 80, r; Vinton County, Locality 84, r. 



Trepospira depressa (Cox) 



1857 Pleurotomaria depressa. Cox, Geol. Rep. Ky., Vol. 3, p. 569, PI. 8, Figs. 10, IGa. 



(Non P. depressa Phillips, 1836) 



Coal Measures: Bonharbour, Daviess County, and Andrie, Muhlenberg 



County, Kentucky. 

 1884 Pleurotomaria illinoisensis. Worthen, Bull. No. 2, Illinois State Mus. Nat. 



Hist., p. 4. 



Coal Measures: Mercer County, Illinois. 



