2H> Xeic Species of Fossils from Ohio. 



ceous beds of eastern New York, while tliis is t]\e prevailing form 

 among the soft shales farther west. The right valve is there 

 recognized as being shorter than the loft, concave instead of con- 

 vex, with an appressed beak or nmbo not extending beyond the 

 cardinal line, and the valve is much thinner in its substance. 



Formation and Locality. — In layers of brownish limestone 

 above the **' Bone-bed," at Fishinger's mill, Franklin Co., Ohio. 

 Collected by the Hyatt brothers, of the State University at 

 Columbus. 



Genus Nyassa, H. & W. Preluii. Notice of Lamellib. Shells of the Up. 

 Held., Hamilton and Chemung Groups, etc. N. Y. State Cab. Nat. 

 Hist., Dec, 1869. page 38. [Generic description omitted. E. P. W.]* 



Nyassa argula, 



Pal. O., Vol. Ill, Plate 7, Fig. 18. 

 yya-sm an/ula H. and W. Prelim. Notice of the Laraellib. Shells of the 



Upper Held., Hamilton and Chemung Groups, etc., distributed without 



author's name, Dec, 1869, p. 28. 



Shell of medium size, transversely sub-ovate or sub-trapezoidal, much 

 longer than high. Valves moderately ventricose, most prominent along the 

 umbonal ridge, which is rather strongly arcuate and sub-angular. Beaks 

 rather small and appressed, slightly incurved, and situated near the an- 

 terior end. Surface of the valve generally declining from the umbonal 

 ridge to the basal line, and with a slight sinus or sulcus below the ridge, 

 which gradually widens toward the margin of the shell, where it causes a 

 broad, but not marked, emargination in the border of the shell. Cardinal 

 slope narrow and abrupt; hinge-line arcuate; posterior end of the shell nar- 

 rowed ; anterior end broad, rounded, and slightly excavated below the 

 beaks. 



Surface of the shell marked by concentric lines of growth parallel to the 

 margin of the valve, and often forming rather strong, irregular varices, 

 most distinctly marked on the anterior half of the shell. 



The Ohio specimens, although preserved in an entiiely dif- 

 ferent matrix, are yet such exact counterparts of the New York 

 shells that no question can exist of their positive identity. 



Formation and Locality. — In limestone above the Bone-bed 

 in T'uUy townshij), Marion Co., Ohio. The sjjocimen figured is 

 from the State Cabinet at the State University, Columbus, Ohio. 



Genus Pala;oneiio, H. & W. 



Preliminary Notice of Lamellib. Shells of the Upper Held. , Hamilton and 

 Chemung Groups, etc., N. Y. State Cab. Nat. Hist., Dec, 1869, p. 6. 



» See note at the close of this article. 



