168 POTTSVILLE FAUNA OF OHIO 



separated anteriorly, those upon the anterior fourth terminating at the 

 lateral margins, the remainder continuing to the posterior margin; 

 between these are extremely fine, closely-placed, concentric striae 

 which may be seen only with the aid of a 12-power magnifier. Interior 

 of the shell very imperfectly known, but not so highly ornamented as 

 the exterioi." 



A single specimen from the Lower Mercer limestone is the only 

 representative of this species found among the collections of Pottsville 

 fauna studied for the present bulletin. Although by no means perfect, 

 the shell presents the large size and subquadrate form which character- 

 izes L. kanawhensis, so that the identification is made with a consider- 

 able degree of confidence. 



Dimensions. Length 19+ mm.; width 14 mm.; convexity cannot 

 be determined on account of compression. 



Horizon and locality. Lower Mercer limestone: Perry County, 

 Somerset, Locality 35, r. 



Lingula sp. 



Description. Large Lingulas of uncertain affinities are common in 

 the black bone shales of the Anthony coal horizon, at mine of the Buck- 

 eye Fire Brick & Clay Co., in Scioto County. Considerable variation 

 exists in the form of the individuals, some being elongate and narrow 

 enough to resemble L. tighti Herrick, while others are broader and 

 suggest a possible identification with L. kanawhensis Price. The 

 lateral margins are subparallel and the front, especially on the broader 

 forms, flattened; the 'surface is apparently smooth. The material at 

 hand, however, is too poor to permit satisfactory conclusions to be 

 reached. Two distinct species may be present, or the differences in 

 form may be due to compression, as the specimens are all much flattened, 

 so that the original shape may possibly have been intermediate between 

 the long slender form and the broader one. The size is much greater 

 than that of L. carbonaria Shumard, and although common, it does not 

 occur in the extreme profusion of the latter species. It is of interest to 

 note that the form under discussion was found within one mile of the 

 Wm. E. Dee mine where L. carbonaria characterized the Anthony shales. 



Dimensions. An elongated, narrow form measures: length 16 mm., 

 width 9.5 mm.; a broad variety: length 13 mm., width 8.5 mm. 



Horizon and locality. Anthony shales: Scioto County, Scioto 

 Furnace, Locality 8, a. 



