DESCRIPTION OP SPECIES 167 



specimen from the same horizon, length 7 mm., width 4.5; an individual 

 of average size from the Quakertown coal horizon, length 6.5 mm., 

 width 4.2 mm. 



Remarks. Lingula carbonaria is an important fossil of the Potts- 

 ville formation in Ohio as it is found on nearly every horizon, and on 

 some in the greatest profusion. In the bone shales associated with 

 the Anthony coal it is extremely abundant and forms the character- 

 istic fossil of that member. It also occurs in similar numbers in the 

 shales at various localities, on other horizons, among which are the 

 Quakertown, Boggs, Upper Mercer, and McArthur. L. umbonata Cox 

 differs in having the greatest width about one-third the length of the 

 shell from the posterior margin, from which point the shell contracts 

 toward the front. L. kanawhensis Price is a much larger and relatively 

 broader form. 



Horizon and locality. Sharon ore horizon: Jackson County, 

 Locality 6, c. Anthony coal horizon: Scioto County, Locality 7, aa. 

 Quakertown coal horizon: Summit County, Locality 12, aa. Lowell- 

 ville member: Muskingum County, Locality 20, aa. Boggs member: 

 Scioto County, Locality 24, a; Vinton County, Locality 25, a. Lower 

 Mercer member: Muskingum County, Locality 45, r; Licking County, 

 Localities 47, 49, r. Upper Mercer member: Vinton County, Locality 

 60, aa; Muskingum County, Locality 68, r. McArthur member: 

 Jackson County, Locality 81, a. 



Lingula kanawhensis Price 



1914 Lingula kanawhensis. Price, W. Va. Geol. Surv., Kanawha Co. Rept., p. 647, 

 PL I, Figs. 5, 6. 



Kanawha Series, Kanawha Black Flint, Queen Shoals, Kanawha County, 

 West Virginia. 



Price s description. "Shell small, oval, subquadrate, thin; beak 

 terminating at hinge line; from which the posterior margin slopes gently 

 away on both sides, forming a broad, flat curve; posterior margins 

 rounding rapidly but smoothly into the lateral margins, which are 

 nearly straight, parallel, and rounding more gradually anteriorly than' 

 posteriorly; posterior margin broadly rounded, greatest width at center; 

 beak and umbonal regions apparently only slightly elevated above the 

 remainder of the shell; greatest convexity apparently in the center, 

 from which the surface falls away gradually and evenly toward the 

 anterior and antero-lateral margins; toward the postero-lateral margins 

 it descends more abruptly and is continued as a triangular raised area 

 narrowing toward the beak. Postero-lateral areas flat. 



Exterior surface ornamented with numerous, fine, raised, con- 

 centric lines of alternating coarseness, the finer being the more numer- 

 ous, crowded closely toward the posterior margin, more distantly 



