The Fcniiia of the Maxi'ille Limestone. 399 



seventy degrees. Aperture broad ovate, modified on the inner 

 side by the preceding vohition, pointed at the upper end and 

 broadly rounded at the base. Surface of the shell smooth and 

 substance very thin [Whitfield, 1895]."' 



Length 30 mm. ; diameter 20 mm. 



The shell is characterized by its medium size and ventri- 

 cose volutions. 



llori.coii and Ioealif\. — Maxville limestone. 

 Shale-nodular zone: Kroft Ih^idge, White Cottage. 



BULIMORPHA MELANOIDES— Whitfield. 



1882. Polyplicinopsis iiiclauoidcs. Whitfield, Ann. N. Y. Acad. Sci., 

 Vol. II, p. 2-2o. 

 Maxville limestone : Newtonville, Ohio. 

 1891. Polypbciiiopsis iiielaiwides. Whitfield, Ann. X. Y. Acad. Sci., 

 Vol. V, p. 592, pi. 14, fig. 13. 

 Maxville limestone: Newtonville, Ohio. 

 1805. Polyphemopsis iiiclaiwidcs. Whitfield, Geol. Surv. Ohio, Vol. VII, 

 p.' 478, pi. 10, fig. 13. 

 Maxville limestone: Xewtnnville, Ohio. 



Description. — Shell below medium size, elongate, similar 

 to a slender cone in outline. Spire elevated and pointed at the 

 apex. Whorls gradually increase in size, about five and half 



Fig. 24. — BuHiiiorplia viclanoidcs. Lateral view. (After Whitfield.) 



in number, moderately and evenly convex, with distinct sutures. 

 Aperture ovate, rounded below, acute above. Columella in- 

 distinct. 

 4 



