208 POTTSVILLE FAUNA OF OHIO 



Horizon and locality. McArthur limestone : Jackson County, 

 Monroe Furnace, Locality 80, r; Vinton County, Moore mine, Locality 



84, r. 



Yoldia stevensoni Meek 



1871 Yoldia stevensoni. Meek, Rep. Regents Univ., W. Va. 



Coal Measures : Monongahela County, West Virginia. 

 1875 Yoldia stevensoni. Meek, Pal. Ohio, Vol. II, p. 335, PL 19, Figs. 4a, 4b. 



Coal Measures: Monongahela County, West Virginia. 



Remarks. This little pelecypod is rare in the Pottsville fauna of 

 Ohio and has been found only in the Lower Mercer member of Mus- 

 kingum and Licking counties. Two fairly perfect valves and several 

 less well preserved individuals are among the collections studied. The 

 form agrees so closely with Meek's figures and description of Yoldia 

 stevensoni that identification with that species is made with confidence. 



Dimensions. Length 13.5 mm., height at umbones 7.5 mm., con- 

 vexity of single valve 1 mm. (crushed). 



Horizon and locality. Lower Mercer member: Muskingum 

 County, Localities 43, 45, r; Licking County, Localities 46, 47, 48, r. 



Genus Anthraconeilo Girty 



Anthraconeilo bownockeri n. sp. 

 PI. X, fig. 21 



Description. Shell small to almost median in size, transversely, 

 ovate in outline, ratio of height to length about 2:3, maximum height 

 about one-third the length of the shell from the posterior margin; mod- 

 erately convex in umbonal region, becoming compressed anteriorly and 

 slightly so at the posterior margin; beak directed posteriorly, promi- 

 nent, elevated above hinge line and slightly incurved, situated about 

 one-third the length of the shell from the posterior margin; anterior- 

 dorsal margin long, sloping downward from the beak to the anterior 

 extremity which is bluntly pointed and considerably produced; poster- 

 ior margin broadly rounded; ventral margin rounded, sloping strongly 

 upward anteriorly to meet the pointed anterior extremity. Surface of 

 internal cast smooth. 



Dimensions. The measurements of the holotype are : length 18 mm., 

 height 11 mm., convexity of left valve 3.5 mm. 



Remarks. This species of Anthraconeilo is of rare occurrence and 

 has been found only in the Sharon ore from which internal casts of 

 single valves of only three individuals have been discovered. It differs 

 from A. taffiana Girty principally in its smaller size and more pointed 



