Pleurotomaria sp. 



Internal casts of small gastropods, evidently of the genus Pleuroto- 

 maria are common in the Boggs limestone, but in the absence of all 

 surface markings, specific identification is impossible. 



Horizon and locality. Boggs limestone: near Hopewell P.O., 

 Muskingum County (Locality 26), c. 



Genus Schizostoma Bronn 

 Schizostoma catilloides (Conrad) 



1842 Inachus catilloides. Conrad, Acad. Nat. Sci. Phil. Jour., 1st Ser., Vol. 8, 

 Pt. 2, p. 272, PL 15, Fig. 3. 

 Carboniferous: Inclined plane of the Allegheny Mountains, Pa. 



Common and widely distributed throughout the Pottsville forma- 

 tion of Ohio. It is present in every member in which marine fauna 

 occurs from the Harrison ore at the base to the Black Flint at the top. 



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

 a. Sharon ore: Lick Run, Scioto County (Locality 2), c. Lowell- 

 ville member: Poverty Run, Muskingum County (Locality 19), r. 

 Boggs member: near Hopewell P.O., Muskingum County (Locality 

 26), c. 



Genus Naticopsis McCoy 

 Naticopsis altonensis (McChesney) 



1865 Natica altonensis. McChesney, 111. New Spec. Foss., p. o, PL 2, Figs. 14 a,b. 



Coal Measures: Alton, Illinois. 

 1868 Naticopsis altonensis. McChesney, Trans. Chicago Acad. Sci., Vol. 1, p. 50, 



PL 2, Figs. 14 a-c. 



Coal Measures: Alton, Illinois. 



A few individuals belonging to this species are among the collec- 

 tions of Boggs fossils. They are characterized by the large lower 

 volution which occupies the entire length of the shell, the high shoulder 

 and prominent depression above the middle of the volution, together 

 with the surface markings of fine, regular, transverse lines. The 

 figured specimen which is somewhat crushed from above, is the most 

 perfect individual obtained. 



Horizon and locality. Boggs limestone: near Hopewell P.O., 

 Muskingum County (Locality 26), r. 



Genus Sphaerodoma Keyes 

 Sphaerodoma humilis (Keyes) ? 



1888 Macrocheilus humilis. Keyes, Proc. Acad. Nat. Sci. Phil., p. 239, PL 12, Fig. ] . 

 Lower Coal Measures: Des Moines, Iowa. 



Internal casts of small, high-spired gastropods from the Harrison 

 ore, with a fold on the columnella and apparently no anterior canal 

 on the outer lip, have been placed under the genus Sphaerodoma. 

 Specifically they have been referred rather doubtfully to S.humilis, 



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