533 



Orthis. 



Orthis sinuata, Hall, Pal. N. Y. Vol. 1, 1847, Hud. River. 





{/^/i.pL^. /^^7; 



Ualt.Pal.Ny, 



Pal. Ohio, Vol. 1, 1873, page 96, plate 9, fig. 4 a, dorsal view of 

 large specimen; 4 5, ventral ; 4 <?, profile; 4 6?, front; 4 ^, in- 

 side of dorsal ; 4/, inside of ventral valve. — Cmcimiati, III, 



Orthis solitaria, Hall, 13th. An. Et. 1860; Pal. N. Y., 



Vol. 4, 1867, page 45, pi. 

 ^^ ^"^ 7, fig. la, dorsal ; 1 S, ven- 



tral valve; Ic, profile; 1 

 t^, hinge. {Compare O. 

 lenticularis^ Van. to 

 which this is so similar. 

 Hamilton.— Ferry Co. (000, spec. 12,819) Marcellus. V/IIh^c. 



Orthis subsequata, (Conrad, Proc. Acad. Nat. Sci. Phila. 



1843, Vol. 1; ChaBy to Trenton 

 groups. — Emmons, Am. Geol. I,ii, 

 1855, 194, plate 9, figs 2 a to f. 

 Differing from Orthis testudinaria 

 merely in^the nearly equal con- 

 vexity of its valves. Emmons. 

 0. submqualis is occasionally 

 found in some of the Trenton leds. 





IDtt.A 



PI.9 



0. E. Hall, T3, 367. 



