256 POTTSVILLE FAUNA OF OHIO 



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1873 Naticopsis altonensis ? Meek and Worthen, Geol. Surv. 111., Vol. 5, p. 595, 

 PI. 28, Figs, lla, b. 

 Coal Measures: Macoupin County, Illinois. 



Description. A few individuals from the Boggs member agree 

 closely with the form figured and described by Meek and Worthen as 

 Naticopsis altonensis ?. They are characterized by the large body whorl 

 which occupies almost the entire length of the shell, the high shoulder 

 and prominent depression above the middle of the volution, together 

 with the surface markings of fine, regular, transverse lines which are 

 present on that species. The figured specimen which is compressed 

 from above, is the most perfect individual obtained. Several, some- 

 what crushed forms from the Lower Mercer limestone have also been 

 referred to the same species. 



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

 cality 26, r. Lower Mercer limestone: Perry County, Locality 35, r; 

 Muskingum County, Locality 27, r; Mahoning County, Locality 55, r. 



Naticopsis nanus (Meek and Worthen) 



1860 Platyostoma nana. Meek and Worthen, Proc. Acad. Nat. Sci. Phil., p. 463. 

 Upper Coa 1 Measures: Springfield, Illinois. 



Remarks. A few- well preserved specimens haye been referred to 

 Naticopsis nanus with considerable confidence. The species is rare 

 although it has been obtained from a number of localities in the Lower 

 Mercer, Upper Mercer, and McArthur members. 



Horizon and locality. Lower Mercer limestone: Muskingum 

 County, Localities 27, 43, 45, r; Stark County, Locality 52, r. Upper 

 Mercer limestone (?): Mahoning County, Locality 76, r. McArthur 

 limestone: Vinton County, Localities 83, 85, r; Hocking County, 

 Locality 86, r. 



Naticopsis pulchella n. sp. 

 PI. XV, fig. 16 



Description. Shell small, transversely ovate and explanate in 

 outline, width about two-thirds the height; spire small, much depressed, 

 scarcely elevated above the body whorl; volutions three, enlarging very 

 rapidly in size; body whorl large, ventricose, composing almost the 

 entire shell, rounded with greatest curvature just below middle; sutures 

 well defined; aperture apparently large, inflated, subcircular to sub- 

 ovate in outline. Surface marked by very fjne transverse lines of 

 growth which curve slightly forward, then backward above the middle 

 of the volution; also by two broad, dark revolving color stripes on the 



