252 POTTSVILLE FAUNA OF OHIO 



Mercer limestone agrees closely with White's description and figures of 

 Pleurotomaria broadheadi. The specimen consists of the two lower 

 volutions on which a portion of the external shell is preserved, showing 

 the slit band and the rather coarse revolving surface markings. 



Horizon and locality. Lower Mercer limestone: Licking County, 

 Flint Ridge, Locality 47, r. 



Pleurotomaria carbonaria Norwood and Pratten 

 PL XV, fig. 14 



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

 2nd Ser., Vol. 3, p. 75, PI. 9, Fig. 8. 

 Coal Measures: Rock Creek, Williamson County, Illinois. 



Remarks. A number of shells, some in an excellent state of preser- 

 vation, belong to the general type of Pleurotomaria referred to as P. 

 carbonaria. It seems probable that several closely related varieties or 

 perhaps species may be included under this term. The specimens 

 from the Pottsville formation of Ohio show the slit band deeply de- 

 pressed as in P. harii, so that it belongs to one of the varieties or phases 

 of P. carbonaria, broadly interpreted, which has the deeply impressed 

 slit band. 



Horizon and locality. Lower Mercer limestone: Scioto County, 

 Locality 31, r; Licking County, Flint Ridge, Locality 47, r; Stark 

 County, Locality 52, r. McArthur member: Hocking County, Locality 

 86, r. 



Pleurotomaria coxana Meek and Worthen ? 



1866 Pleurotomaria coxana. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 272. 



Lower Coal Measures: Nolan's Furnace, Edmonson County, Kentucky. 

 1873 Pleurotomaria coxana. Meek and Worthen, Geol. Surv. 111., Vol. 5, p. 600, 



PI. 28, Fig. 15. 



Coal Measures: Nolan's Furnace, Edmonson County, Kentucky. 



Description. A single vertically compressed, internal cast of a 

 Pleurotomaria from the Lower limestone of Flint Ridge shows the fine, 

 thread-like, transverse markings and general form of P. coxana, al- 

 though slight differences may be ascribed to compression. However, 

 until better specimens are obtained with which to verify the identifica- 

 tion, the exact agreement of the two forms must remain somewhat un- 

 certain. 



Horizon and locality. Lower Mercer limestone: Licking Count}, 

 Flint Ridge, Locality 47, r. 



