468 
PALAEONTOLOGY OF NEW YORK. 
Surface marked by fine concentric stride, 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 striae. 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 comity ; Pratt’s falls and Skaneateles lake, Onondaga county ; and 
Mt. Upton, Chenango county, N. Y. 
ClMITARIA ANGULATA, 11. Sp. 
PLATE LXXVII, FIG. 15. 
In part Cimitaria recurva (Conrad), Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PL 77, 
tig's. 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, flat 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- 
