180 POTTSVILLE FAUNA OP OHIO 



Horizon and locality. Boggs member: Muskingum County, Lo- 

 cality 27, r. Widely distributed throughout the Lower Mercer, Upper 

 Mercer, McArthur, and Black Flint members, aa. 



Genus Aulacorhynchus Dittmar 



Aulacorhynchus millepunctatus (Meek and Worthen) 

 PI. VII, fig. 12 



1870 Chonetes ?? millepunctatus. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., 



p. 35. 



Upper Goal Measures: Marion County, Illinois. 

 1873 Chonetes ?? millepunctata. Meek and Worthen, Geol. Surv. 111., Vol. 5, p. 566, 



PI. 25, Fig. 3. 



Upper Coal Measures: Marion County, Illinois. 



Description. The occurrence of this large brachiopod in the Potts- 

 ville formation of Ohio is confined, so far as is known, to the Lower 

 Mercer member of a single locality in Vernon Township, Scioto County. 

 A dozen or more specimens of dorsal valves, some of which are fairly 

 well preserved, were observed and were found to agree with the Illinois 

 form so closely that the identification was made with considerable 

 confidence. The presence of Aulacorhynchus millepunctatus in the 

 middle Pottsville of this State is of especial interest as the species be- 

 longs distinctly to the Upper Pennsylvanian; its occurrence in any of 

 the higher formations of the Pennsylvanian system of Ohio has not 

 been recorded. 



Dimensions. Length of the largest specimen found 20 mm.; 

 width 58 mm. ' 



Horizon and locality. Lower Mercer member: Scioto County, 

 Locality 31, c. 



Genus Product us Sower by 



Productus cora d'Orbigny 

 PL VIII, figs. 1-3 



1847 Productus cora. De Koninck, Monog. du Gen. Prod, et Chon., p. 50, PI. 4, 

 Figs. 4a, b; PI. 5, Figs. 2a-d. 



Carboniferous: Guernsey County, Flint Ridge, and Zanesville, Ohio; Indi- 

 ana; Nova Scotia; Bolivia, etc., South America. 



Description. This species is a common one in the marine lime- 

 stones of the Pottsville formation, but does not become abundant 

 below the Lower Mercer member. Although it varies much in size, it 

 is generally very large; a representative specimen from the Lower 



