The Fauna of the Maxville Limestone. 



403. 



zigzag across the median periplieral tliird, and on the basal third 



bend abruptly forward. 



Length 15 mm.; diameter 20 mm. 



The shell is readily identified by its depressed spire, large 



aperture, and the zigzag striae of the median portion of the body 



whorl. 



Horizon, arui locality. — IMaxville limestone. 



Upper zone : Below Thompson Residence, White Cottage. 



Shale-nodular zone: Cut No. 5, Upper end Cut No. 6, Mt. 

 Perry-Fultonham ; Kroft Bridge, White Cottage. 



Lower zone : Bridge Gull3^ Mt. Perr3^-Fultonham. 



Undetermined zone : Middle of Cut No. 6, Mt. Perry-Ful- 

 tonham. 



BELLEROPHON ALTERNODOSUS— Whhfield. 



1882. Bellerophon altenwdosus. Whitfield, Ann. N. Y. Acad. Sci., Vol. 

 II, p. 2-25. 

 Maxville limestone : Newtonville, Ohio. 

 1891. Bellerophoi! altcrnodosus. Whitfield, Ann. N. Y. Acad. Sci., Vol.. 

 V, p. 533, pi. 14, figs. 17-19. 

 Maxville limestone : Newtonville, Ohio. 

 1895. BcUernplwn altenwdosus. Whitfield, Geol. Surv. Ohio, Vol. VII, 

 p. 479, pi. 10, figs. 17-19. 

 Maxville limestone : Newtonville, Ohio. 



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

 what subglobose in general form, with an appearance of being 



Fig. 28. — Belleroplwii alternodosits. 



a, b, and c. — Apertural, dorsal, and profile 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 



