88 PALEONTOLOGY OF NEW YORK. 



Cbenipecten Leon. 



hLATK IX, FIG. 12 ; and I'LATK L.XXXIII, FIG. 8. 

 Crmiperteit Leim, U.ku.. I'al. N. V.. vol. v, pt. 1. Plato.s and Explanations: PI. !». tip. 12. Jan., 1883. 



L511K1.1. of meiliuiii .size, ovate, slightly oblique ; length about one-sixth less than 

 the height; margins regularly curNcd, produced below, rather straight on 

 the upper part of the posterior side. 



Left valve moderately convex ; the greatest convexity is a little lielow the 

 middle. 



Hinge-line straight, short, nearly central ; length aliout oiio-third the 

 lieight of the valve. 



Beak acute, erect. Uniboiial region not strongly marked, subtending an 

 acute angle. 



Ears sub-equal, small, sulci not conspicuous; posterior ear tlie larger. 

 A narrow rim, slightly elevated and free from rays, extends from the poste- 

 rior ear along the margin of the shell. 



Surface marked with numerous distinct, rounded or sub-angular rays, and 

 wilier interspaces with smallei- intiTuiediate rays; with line concentric .strise 

 and undulations at irregular intervals. The rays are stronger over the pos- 

 terior half of the valve. 



Ligamental area linear, and crenulated with narrow cartilage-pits. 



The specimen liguri'(l has a length of l^Ci mm., lieight .30 mm., hiiige-liue 

 KJ mm. 



This species differs iVoiii nil the others in its form and surface chiiracters. 

 Formation and locality. In sandstone of the Chemung grouj) at Leon, Catta- 

 raugus county, N. Y. 



