468 PALEONTOLOGY OF NEW YORK. 



Surfjwe marked by fine concentric 8tria9, which are irregularly fasciculate 

 and are raised into strong undulations on the anterior portion of the shell. 

 In well-preserved specimens the surface is also marked by fine radiating 

 pustulose stria3. In addition to this the post-cardinal slope is sometimes 

 marked by distant radii. 



Four specimens measure respectively 90, 91, 92 and 108 mm. in length, 

 and 35, 36, 35 and 38 mm. in height. 



This species is distinguished from all the preceding by its extremely falcate 

 form, more rounded posterior extremity and the strongly pustulose and radiat- 

 ing .surface. 



Formation and localities. In the Hamilton group near Hamilton and Earlville, 

 Madison county ; Pratt's falls and Skaneateles lake, Onondaga county ; and 

 Mt. Upton, Chenango county, N. Y. 



CiMITARIA ANGCLATA, n. Sp. 



PLATE LXXVII, FIG. 15 



In part Cimitaria recurva (Conkad), Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations : PI. 77, 



figs. 9-16. 1883. 



Shell large, falcate ; length less than three times the height ; basal margin 

 gently curved, with a slight sinuosity a little in advance of the anterior third. 

 Posterior extremity obliquely truncate. Cardinal line concave. Anterior 

 end very short, almost vertically truncated by the lunule, and abruptly 

 rounded below. 



Valves moderately convex below, depressed on the posterior slope, and 

 gibbous in the umbonal region. 



Beaks sub-anterior, prominent and incurved. Umbonal slope prominent, 

 distinctly angular, the angularity extending to the post-inferior extremity. 

 Post-cardinal slope broad, tlat or slightly concave. Cincture an undefined 

 depression, extending from the beak to the base and giving a slight sinuosity 

 to the margin. 



Surface marked by fine regular concentric striae which are .somewhat fas- 



