Lowellville limestone ? and the other in the Lower Mercer, distant 

 from each other, yet faunally very similar and unique. The some- 

 what square posterior outline, long cardinal margin, prominent beaks, 

 and fine, regular, concentric lines characterize the form. It is, how- 

 ever, too poorly preserved to be identified specifically. The measure- 

 ments of a specimen of average size are: length 9.5 mm., height 6.5 

 mm., length of cardinal margin 6 mm. 



Horizon and locality. Lowellville member ?: Near Holbein, 

 Muskingum County (Locality 20), a. Lower Mercer limestone: 

 Rock Hollow, Vinton County, a. 



PHYLUM MOLLUSCA 



Class Gastropoda 

 Family Bellerophontidae McCoy 



No fossils are more abundant in the Harrison and Sharon ores 

 than the Bellerophon- like shells which can be obtained in an almost 

 perfect condition. They are diminutive in size and occur as internal 

 casts, so that in most cases even the generic position is undeterminable. 

 In only a few instances, however, is surface sculpture shown sufficiently 

 well to disclose the generic and specific relations. 



Genus Bellerophon Montfort 

 Bellerophon crassus Meek and Worthen? 



I860 Bellerophon crassus. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 458. 

 Lower Coal Measures: Pittsburg, St. Clair County, Illinois. 



Several of the numerous small Seller ophon-like forms from the 

 Harrison and Sharon ores show a narrow slit band with faint lines 

 of growth, and have been referred provisionally to B.crassus. The 

 species has not been found on any other Pottsville horizon below 

 the Lower Mercer limestone. 



Horizon and locality. Harrison ore: Jackson County (Locality 

 1), a. Sharon ore: Lick Run, Scioto County (Locality 2), a. 



Genus Euphemus McCoy 

 Euphemus carbonarius (Cox) 



1855 Bellerophon urii. Norwood and Pratten, Jour. Acad. Nat. Sci. Phil., 2nd Ser., 

 Vol. 3, p. 75, PI. 9, Figs. 65 (Not B.urii Fleming, 1828.) 

 Coal Measures: Galatia and Grayville, Illinois; 5 miles below New Har- 

 mony, Indiana. 



1857 Bellerophon carbonarius. Cox, Geol. Surv. Ky., Vol. 3. p. 562. 

 Coal Measures: Indiana. 



Among the numerous Bellerophon- like forms from the Harrison 

 and Sharon ores, several individuals retain indications of numerous 

 strong, revolving lines and have been identified as E. carbonarius, 

 at least according to the generally usage of the term which may include 

 several distinct species. It is also found rarely in the Boggs, but is 



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