262 POTTS VILLE FAUNA OP OHIO 



Sphaerodoma klipparti (Meek) 

 PI. XV, fig. 21 



1872 Macrocheilus Klipparti. Meek, Proc. Acad. Nat. Sci. Phil, for 1871, PL 328. 



Lower Coal Measures: near Somerset, Perry County, Ohio. 

 1875 Macrocheilus Klipparti. Meek, Pal. Ohio, Vol. II, p. 346, PL 20, Figs. Ga-c. 



Lower Coal Measures: near Somerset, Perry County, Ohio. 



Meek's description. "Shell attaining a large size, elongate-sub- 

 fusiform, the length being sometimes from two and a half to three 

 times the breadth; spire pointed at the apex, forming about half the 

 entire length with its lateral slopes concave above and convex below; 

 volutions six to eight or nine, the upper five or six being very com- 

 pactly coiled, and forming comparatively but a small part of the entire 

 shell, while those below suddenly increase in size much more rapidly 

 than the others, particularly in the direction of the longer axis of the 

 shell, and form most of its bulk, these larger turns in large adult ex- 

 amples sometimes assuming together a subcylindrical outline; last 

 or body whorl comparatively long, cylindrical, or more or less oval, 

 and somewhat produced below; suture moderately distinct, almost 

 transverse between the smaller turns, but becoming decidedly more 

 oblique below; aperture comparatively small and narrow, apparently 

 subrhombic in form and effuse below; inner lip much thickened all the 

 way up; columnella twisted, so as to form a single prominent fold 

 below the middle of the aperture. Surface nearly smooth, or only 

 showing very obscure lines of growth. Outer lip unknown. 



"Length of one of the largest, most elongate specimens, 2.23 inches; 

 breadth 0.87 inch; length of aperture, about 1 inch." 



Remarks. Our specimens agree quite closely with Meek's descrip- 

 tion and figures. The species is somewhat common in the Lower 

 Mercer and McArthur members, although the individuals found at any 

 one locality are few. The outer lip is not preserved on any of the 

 specimens examined, most of them occurring as internal casts. 



Horizon and locality. Widely distributed in the Lower Mercer 

 limestone, c (especially common in Muskingum and Licking counties). 

 McArthur limestone: Vinton County, Moore mine, Locality 84, c. 



Sphaerodoma humilis (Keyes) ? 



1888 Macrocheilus humilis. Keyes, Proc. Acad. Nat. Sci. Phil., p. 239, PL 12, Fig. 1. 

 Lower Coal Measures: Des Moines, Iowa. 



Description. Internal casts of small high-spired gastropods from 

 the Harrison ore, with a fold on the columnella and apparently no 



