204 POTTSVILLE FAUNA OF OHIO 



Genus Nuculopsis Girty 



Nuculopsis ventricosa (Hall) 

 PL X, fig. 20 



1858 Nucula ventricosa. Hall, Geol. Iowa, Vol. 1, Pt. 2, p. 716, PL 29, Figs. 4, 5a, b. 



Coal -Measures : Iowa. 

 1915 Nuculopsis ventricosa. Girty, U. S. Geol. Surv., Bull. 544, p. 117, PL XV, 



Figs. 1-8. 



Wewoka formation: Oklahoma. 



Remarks. Nuculopsis ventricosa occurs in the basal member of the 

 Pottsville and ranges throughout the entire formation, although in- 

 dividuals are by no means common. It is most common in occurrence 

 in the Lower Mercer and McArthur members. In the Harrison ore it 

 is associated with N. subrotundata Girty mss., and in the Sharon ore 

 with N. subrotundata, N. lunulata Girty mss., and'JV. elongata n. sp. 



Dimensions. A considerable variation exists in the size of indi- 

 viduals; a specimen of average size from the Sharon ore measures: 

 length 9.2 mm., height 7 mm., thickness of a single valve 3.5 mm.; 

 from the Lower Mercer limestone: length 11 mm., height 8 mm., thick- 

 ness of a single valve 2.5 mm. 



Horizon and locality. Harrison ore: Jackson County, Locality 1, 

 r. Sharon ore: Scioto County, Locality 2, r. Lower Mercer limestone: 

 Perry County, Locality 35, r; Muskingum County, Localities 36, 43, r: 

 Licking County, Locality 48, r. McArthur limestone: Vinton County, 

 Locality 84, r. 



Genus Leda Shumacker 



Leda bellistriata Stevens 

 PL X, fig. 27 



1858 Leda bellistriata. Stevens, Am. Jour. ScL, 2nd Ser., Vol. 25, p. 261. 



Coal Measures: Danville, Illinois; Summit, Ohio. 

 1915 Leda bellistriata. Girty, U. S. Geol. Surv., Bull. 544, p. 122, PL XIV, Figs. l-9a. 



Wewoka formation: Oklahoma. 



Remarks. Leda bellistriata appears in the Lowell ville limestone 

 and continues throughout the middle and upper Pottsville, but it has 

 nowhere been found in considerable numbers; it is most common, how- 

 ever, in the Lower Mercer member on Flint Ridge. Specimens from 

 Ohio compare closely with those figured by Girty from the Wewoka 

 formation of Oklahoma but are, on the average, smaller. 



Dimensions. A large specimen from the Lowellville limestone 

 measures: length 10.5 mm., height 5.5 mm. An individual of unusually 



