681 



Plat. 



VII. / 



F/JI3 



//A 



spirale ; Alb my and 8cboh<tne Cos., N. Y. Oriskany sand- 

 stone, — In Pennsylvania, Montour county, Cooper township, 

 Grove Bro.'s tunnel, found by I. O. White (G7, p. 86, 297) and 

 identified by Olaypole, with P. magniiiGum^ and P. ventri- 

 Gosum,, in Oriskany. Also at Mapleton, Huntingdon county, 

 (T3, p. 119) below the middle of the Oriskany. VII. 



Platyceras trilobatum. 



Hall, Palaeontology of New York 

 Volume 3, 1859, 

 wood cut figure 3; 

 from the Lower 

 Helderlerg forma- 

 tion in New York. 

 — YL 



Ha/I III 



Platyceras undatum, {P. subnodosum of Conrad'?) Hall, 



3,* 



^ 



>^-^^ 



,,, J, -J 



fiallPaW NXVo/.V,,,. 



