250 POTTSVILLE FAUNA OF OHIO 



% 



carina which becomes nodose towards the aperture; a broadly concave 

 depression on each side of the carina where the shell is thinner, becom- 

 ing convex and extremely thickened towards the margins." 



Remarks. Individuals of this species vary considerably in size 

 although they are generally large and robust. The revolving lines on 

 the inner lip are sharply marked and the double row of slightly nodose 

 carinae are highly elevated near the aperture. The form is common 

 in the middle and upper Pottsville formation but has not been found 

 below the Lower Mercer limestone. 



Horizon and locality. Widely distributed in the Lower Mercer 

 limestone, c. McArthur limestone: Vinton County, Locality 84, c. 



Genus Bucanopsis Ulrich 

 Bucanopsis meekiana (Swallow) 



1858 Bellerophon Meekianus. Swallow, St. Louis Acad. Sci. Trans., Vol. 1, p. 204. 



(Date of Imprint, 1860) 



Middle Coal Measures: Lexington, Missouri. 



Lower Coal Measures: Howard County, Missouri. 

 1915 Bucanopsis meekiana. Girty, U. S. Geol. Surv., Bull. 544, p. 169, PI. XX, Figs. 



4-6. 



Wewoka formation: Oklahoma. 



Description. Specimens referred to this species are present in the 

 middle and upper Pottsville formation and are relatively common in 

 the Lower Mercer limestone. Individuals are generally crushed and 

 fragmentary with very little of the outer lip preserved. The surface 

 is marked by numerous fine, subequal revolving lirae crossed trans- 

 versely by lines of a similar character. The slit band is only slightly 

 elevated. 



There appears to be very little real difference between the form 

 here referred to B. meekiana and the one which Meek identified with 

 Geinitz' species Bellerophon marcouanus, 1 and it does not seem at all 

 unlikely that the two forms are identical. However Meek's species 

 differs from typical B. marcouanus as figured by Geinitz in its less highly 

 elevated slit band which is to a much less extent affected by the trans- 

 verse markings than Geinitz' form. Otherwise B. meekiana and 

 Geinitz' species are so similar that future investigation may prove 

 that they are one and the same species. At present B. meekiana seems 

 the more apt specific reference for our form. 



Horizon and locality. Widely distributed throughout the Lower 

 Mercer limestone of Muskingum and Licking counties, c. McArthur 

 member: Jackson County, Locality 80, c; Vinton County, Locality 84, c. 



'Meek, F. B., U. S. Geol. Surv. Nebr., p. 226 ,P1. 4, Fig. 17, 1872. 



