The Fauna of the Ma.vz'iHc Limestone. 



403 



zigzag across the median ijeriplieral tliird. and on tlie Ijasal third 



bend abruptly forward 



Lengtli 13 mm.: (Hameter 20 mm. 



The shell is readily identihed by its depressed spire, large 



aperture, and the zigzag stria? of the median portion of the body 



\\ horl. 



Horizon and localiiy. — 3ilaxville limestone. 



Upper zone: llelow Thompson Residence, \\'h,ite Cottage. 



Shale-nodular zone: Cut Xo. 5, Upper end Cut Xo. 6, Alt. 

 Perry-Fuhonham ; Kroft IJridge, White Cottage. 



Lower zone: IJridge (jully, Mt. Perry-Fultonham. 



Undetermined zone: Middle of Cut Xo. 6, Mt. Perry-Ful- 

 tonham. 



BELLfcROPHON ALTERKODOSUS— Whiilield. 



188-i. BcUeiothon altcniodosus. Whitfield, Ann. N. Y. Acacl. Sci., Vol. 

 II, p. 22.J. 

 Maxville limestone: Xewtonville, Ohio. 

 18111. Bcllcruhhoi! alicnKxlosiis. Whitfield, Ann. X. Y. Acad. Sci., Vol. 

 V, p. 5:1:!, pi. 14, figs. 17-l!l. 

 Maxville limestone: Xewtonville, Ohio. 

 1895. BcUcn^t^Jiuii alteniodosits. Whitfield, Geol. Surv. Ohio, Vol. VII, 

 p. 4711, pi. 10, figs. 17-1!). 

 Maxville limestone: Xewtonville, Ohio. 



Description. — "Shell of about a medium size, and some- 

 what subglobose in general form, with an appearance of being 



Fk;. 28. — Bcllcrophoii alteniodosus. 



a, 1), and c. — Ajjertural, dorsal, and i)rohle views of the same speci- 

 men. (.After Whitfield.) 



slightly flattened on the dorsum in immature specimens ; while 

 on the adult forms, the dorsum is marked on the outer half of 



