418 PALEONTOLOGY OF NEW YORK. 



Valves regularly convex below the middle, becoming ventricose above. 

 Hinge-line straight. Ligamcntal area short and high. 

 Beaks sub-central, elevated, prominent and incurved. 

 Surface marked by very numerous fine and closely arranged flattened 

 radii, and by very fine concentric striae. Interior unknown. 



The specimen described has a length of 48 mm. and a height of 42 mm. 



This species is distinguished by its extreme ventricosity of the valves, prom- 

 inent beaks and finely radiated surface. 



Formatim and locality. In the Goniatite limestone of the Marcellus shale, 

 Schoharie county, N. Y. 



Panenka Hero. 



PLATE LXIX, FIG. 3. 

 Carduilaf Heti>, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 69, fip. 3. 1883. 



Shell small, sub-circular ; length a little greater than the height. Pallial mar- 

 gin regularly rounded. 



Valves moderately convex. 



Hinge-line short. Ligamental area narrow. 



Beaks sub-central, small, pointed and incurved. 



Surface marked by strong rounded or sub-angular plications, some of which 

 q,re duplicate. The plications are direct on the anterior portion of the shell 

 and curving on the posterior. Interradial spaces about equal in width to 

 the radii. Entire surface also marked by fine undulating concentric striiB. 

 Interior imknown. 



One specimen has a length of 32 mm. and a height of 29 mm. 



This species differs from any other in the strong elevated distant radii, and 

 in its small pointed beaks. 



Formation and localities. In the Marcellus shale, on the Indian Reservation, 

 near Buff'alo, and in the same horizon near West Avon, N. Y. 



