Until more and better material can be obtained, it seems advisable 

 to refer to this Productus as a variety of P. semireticulatus. 



Horizon and locality. Boggs member: near Hopewell P. 0. 

 (Locality 26), c; Blunt Run (Locality 27), c; Rock Cut (Locality 28), c, 

 Muskingum County. 



Genus Pustula Thomas 

 Pustula nebraskensis (Owen) 



1852 Productus nebraskensis. Owen, Geol. Rep. Wisconsin, Iowa, and Minnesota, 

 p. 594, tab. 5, Fig. 3. 

 Carboniferous limestone: Bellevue, Missouri River, Nebraska. 



This common Pennsylvanian fossil occurs abundantly in the 

 Pottsville formation of Ohio, and is among the most widespread forms. 

 Although it characterizes the marine limestone horizons, it has not 

 been found to occur below the Lowellville member. Much of the 

 material in the collections studied is in an excellent state of preservation. 



Horizon and locality. Lowellville member: Poverty Run, Mus- 

 kingum County (Locality 19), r; Lowellville, Mahoning County 

 (Locality 22), r. Common and widely distributed in the Boggs 

 limestone. Abundant and widely distributed in the middle and 

 upper Pottsville members. 



Pustula pertenuis (Meek) 



1866 Productus cancrini. Geinitz (non de Verneuil) Garb, und Dyas in Nebraska, 

 p. 54, PL 4, Fig. 6. 

 Nebraska City, Nebraska. 



1872 Productus pertenuis. Meek, U. S. Geol. Surv. Nebr, p. 164, PL 1, Fig. 14; 

 PL 8, Fig. 9. 



Upper Coal Measures: Nebraska City and Brown ville, Nebraska; Grass- 

 hopper Creek, Kansas. 



A few specimens of this small species of Pustula were found in 

 the Sharon ore, although none were discovered on any other horizon 

 of the Pottsville formation in the State. The small size, the very 

 fine radiating lines, and the numerous concentric wrinkles covering 

 the entire shell, together with a few scattered spine bases make the 

 form easily recognizable. 



Dimensions. Length 8 mm., width 11 mm., convexity 4 mm. 



Horizon and locality. Sharon ore: Lick Run, Scioto County 

 (Locality 2), r. 



Pustula punctatus (Martin) 



1836 Productus punctatus? Morton, Am. Jour. Sci., 1st Ser., Vol. 29, p. 153, PL 26, 



Fig. 38. 



Coal Measures: Ohio Valley. 

 1838 Producta semipunctata . Shepard, Am. Jour. Sci., 1st Ser., Vol. 34, p. 153, 



Fig. 9. 



Limestone: Peru, Illinois. 



Description. Pustula punctatus is of somewhat rare occurrence 

 in the Pottsville rocks of this State. It is generally well preserved 



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