296 TRANS. ‘OF THE ACAD. OF SCIENCE. 
from beak to front, and a low, broad mesial elevation, which 
is scarcely perceptible except near the front; beak depniaat 
gently convex and closely incurv ‘ace marked with 
numerous rather coarse, rounded, radiating strie, their nun 
ber increased by bifurcation and insertion. The 
—. take place near the beak. At the pare the num 
r of strie amount to from thirty to thirty-five om each valve. 
Dimensions. on 0.58; width, 0.76; ( 
e species, and quite characteristic of the White 
Limestone of the Guadalupe Mts. of New Mexico oni 
CamaRApuoria (?) BisuLcaTa, JV. sp. 
convex, iarceen convexity near the beak; 
por aha an obtuse angle; mesial sinus aed at. 
searcely reaching the m the a of the valve, eye 
peo dewer ot rene tims 8 
