390 
PALAEONTOLOGY OF NEW YORK. 
extremity. Posterior margin vertically sub-truncate. Cardinal line straight. 
Anterior end short, abruptly rounded below the lunule. 
Valves convex below and posteriorly, gibbous in the middle and umbonal 
region. 
Beaks sub-anterior, rather prominent, rising a little above the hinge-line. 
Umbonal slope prominent, scarcely defined, but extending to the post-inferior 
extremity. Post-cardinal slope broad. 
Surface marked by fine concentric striae, which are abruptly recurved over 
the umbonal slope, and are fascicled, rising into lamellose elevations. Inte¬ 
rior unknown. 
A specimen has a length of 30 mm. and a height of 21 mm. 
This species differs from E. Philipi in its rhomboidal form, truncate posterior 
end, prominent umbonal slope and lamellose concentric striae. 
Formation and localities. In the sandstones of the Chemung group, at Cold 
Spring, Cattaraugus county, and doubtfully near Olean, N. Y. 
Edmondia Burlingtonensis. 
PLATE LXIV, FIG. 22 ; AND PLATE XCV, FIGS. 13, 14. 
Edmondia Burlingtonensis, White and Whitfield. Proc. Bost. Soc. Nat Hist., vol. 8, p. 301. 1802. 
In part Edmondia Burlingtonensis (White and Whitfield), Hall. Prelim. Notice Lamellibrancliiata, 2, 
p. 90. 1870. 
“ “ “ “ “ Pal. N. Y., vol. v, pt. 1. Plates and 
Explanations: PL 64, figs. 19-29. 
1888. 
Shell of medium size, ovate-elliptical; length one-third greater than the 
height; basal margin straight in the middle, curving into both extremities. 
Posterior margin regularly rounded. Cardinal line straight. Anterior end 
short and regularly rounded. 
Valves moderately convex below and posteriorly, gibbous in the middle 
and umbonal region. 
Beaks at about the anterior fourth, prominent, incurved. Umbonal slope 
convex, not defined, merging into the general convexity of the shell before 
reaching the post-inferior extremity. 
