and universally distributed in the Lowellville, Boggs, and higher mem- 

 bers of the Pottsville formation. 



PHYLUM MOLLUSCA 



Class Pelecypoda 



Genus Solenomya Lamark 



Solenomya ?? sharonensis n.sp. 



PI. IV., Fig. 16 



Description. Shell small, transversely subovate, length about 

 twice the height; convex, the point of greatest convexity being 

 about two-fifths the width of the shell from the beak to the inferior 

 margin: beak pointing obliquely forward, incurved, slightly elevated 

 over the cardinal margin, situated about one-third the length of the 

 shell from the anterior extremity; cardinal margin equal to one-half 

 the length of the shell, sloping slightly downwards; ventral or inferior 

 margin long, almost straight, rounding abruptly into the posterior 

 extremity which is obliquely truncated above and forms an angle 

 of 145 degrees with the hinge line, most extended below the middle 

 of the shell; anterior extremity broadly rounded, slightly concave 

 in outline anterior to the beak, most prominent about the middle 

 of the valve or a little below; a prominent umbonal ridge extending 

 from the beak to be posterior-ventral angle. Surface smooth except 

 for a few obscure, concentric lines of growth; shell very thin and 

 fragile. 



Dimensions. The measurements of the holotype are: length 

 13.5 mm., length of hinge line 6.2 mm., height 6.8 mm., convexity of 

 right valve 2.4 mm. 



Remarks. There is much doubt concerning the generic identifi- 

 cation of this shell for it is not very closely allied to any Pennsylvanian 

 genus. It is very possible that it does not belong to the genus Solen- 

 omya which lacks the more prominent beak and umbonal develop- 

 ment of the form under discussion; however, as the form appears 

 most closely related to Solenomya, it seems best to place it provision- 

 ally with that genus. One would scarcely be justified in establishing 

 a new genus from the material at hand which does not show the char- 

 acters of the hinge and interior adequately. It is confined to one 

 locality of the Sharon ore and has been found only as internal casts. 



Horizon and locality. Sharon ore: Lick Run, Scioto County 

 (Locality 2), r. 



Genus Solenomorpha Cockerell 



Solenomorpha lamborni n.sp. 

 PI. IV, Fig. 6 



Description. Shell small, elongate, length about four times the 

 height; convex with the maximum convexity in the anterior half of 



61 



