DESCRIPTION OF SPECIES 251 



Genus Patellostium Waagen 



Patellostium montfortianum (Norwood and Pratten) 

 PL XIV, figs. 13, 14 



1855 BeUerophon Montfortianum. Norwood and Pratten, Jour. Acad. Nat. Sci. Phil., 

 2nd Ser., Vol. Ill, p. 74, PI. IX, Figs. 5a-c. 

 Coal Measures: Galatia, Illinois, and 5 miles below New Harmony, Indiana. 



Description. Patellostium montfortianum is common in the Lower 

 Mercer limestone but is found less frequently in the higher horizons 

 of the Pottsville formation. It generally occurs in a crushed condition 

 with little or none of the greatly expanded outer lip preserved. How- 

 ever, it can be readily recognized by its distinctive surface sculpture 

 of large, rounded, revolving lirae, separated by about three to five 

 smaller lirae of varying size, and by coarse, angular, transverse folds 

 which only slightly affect the slit band. 



Horizon and locality. Widely distributed in the Lower Mercer 

 limestone, c (especially common and characteristic in Muskingum and 

 Licking- counties). Me Arthur member: Vinton County, Locality 84, c; 

 Hocking County, Locality 86, c. Black Flint member: Jackson County, 

 Locality 88, r. 



Family Pleurotomariidae d'Orbigny 



Representatives of this family are very abundant in the Harrison 

 and Sharon ores, and at least four forms, possibly more, are thought 

 to be present. They occur, like the entire assemblage of fossils from 

 these horizons, as internal casts or molds, which show the form but 

 give little clue to the external characters. These Pleurotomaria-like 

 forms, which are all very small, may_prove to be new species, although 

 no definite conclusions can be reached concerning them, unless the 

 examination of more material may reveal something concerning the 

 external markings of the group. In only one species is the surface 

 sculpture preserved in the molds. The family ranges throughout the 

 Pottsville formation, but is nowhere above the Sharon ore a common 

 or characteristic group. 



Genus Pleurotomaria Sowerby 



Pleurotomaria broadheadi White 



1880 Pleurotomaria broadheadi. White, Cont. to Inv. Pal., No. 8, p. 169, PL 42, 

 Figs, la, b. 

 Coal Measures: Kansas City, Missouri. 



Remarks. A fragment of a very large gastropod from the Lower 



