398 Proceedings of the Ohio State Academy of Science. 



limestone, and is found in great numbers in the shale-nodular 



zone. 



Horizon and locality. — Maxville limestone. 



Upper zone : Mouth of Buckeye Fork, Fultonham ; Gladstone 

 Mills, Below Thompson Residence?, White Cottage; Smith 

 Chapel, Logan. 



Shale-nodular zone: Cut No. 5, Mouth of Hough Hollow, Mt. 

 Perry-Fultonham ; Kroft Residence, Kroft Bridge, White 

 Cottage ; Stimmel Residence, Maxville ; Smith Chapel, 

 Logan. 



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

 ham. 



HOLOPEA NEWTONENSIS— Whitfield. 



1882. Holopea Neivtoneiisis. Whitfield, Ann. N. Y. Acad. Sci., Vol. II, 

 p. 224. 

 Maxville limestone : Newtonville, Ohio. 

 1891. Holopea Newtonensis. Whitfield, Ann. N. Y. Acad. Sci., Vol. V, 

 p. 591, pi. 14, fig. 12. 

 Maxville limestone: New^tonville, Ohio. 

 jL895. Holopea Newtonensis. Whitfield, Geol. Surv. Ohio, Vol. VII, p. 

 477, pi. 10, fig. 12. 

 Maxville limestone : Newtonville, Ohio. 



Description. — "Shell of medium size, ovate in outline and 

 ^ventricose, with a moderately elevated spire and extremely ven- 



-FiG. 23. — Holopea newtonensis. Lateral view. (After Whitfield.) 



tricose volutions, which increase very rapidly in bulk from the 

 apex. Volutions three and half to four in number, with strongly 

 rounded surfaces and moderate sutures. Apical angle about 



