LAMELLIBRANCHIA TA. 
Crenipecten liratus. 
PLATE IX, FIG. 24; and PLATE LXXXIII, FIG. 9. 
Crenipecten liratus, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 9, fig. 24. Jan., 1883. 
Shell small, obliquely sub-ovate; length a little less than the height; anterior 
and basal margins rounded; post-basal margin produced, and thence extend¬ 
ing in a direct line to the beak. 
Left valve moderately convex, the greatest convexity distant one-third the 
height of the valve from the beak. Right valve unknown. 
Hinge-line straight, short, length about one-third the height of the valve. 
Beak acute, erect, a little anterior to the centre of the shell, not rising- 
above the hinge. Umbonal region moderately elevated, subtending an acute 
angle. 
Ears small, triangular, defined by moderate sulci; the posterior ear the 
larger. Byssal sinus not distinct. 
Surface marked by prominent, rounded, alternating radii, with interme¬ 
diate smaller ones. There are about six larger rays, six smaller, and twice 
that number of still smaller intermediate striae, all crossed by strong, regular, 
concentric laminae of growth. The ears are apparently destitute of rays. 
The crenulations of the ligamental area are small and obscure. 
The specimen figured has a length of 20 mm., height 22 mm., hinge-line 
7 mm. 
This species somewhat resembles C. micropterus in the radii, but differs in all 
other characters. 
Formation and locality. Chemung group at East Randolph, Cattaraugus 
county, N. Y. 
