388 PALEONTOLOGY OF NEW YORK. 



Edmondia obliqua, n. sp. 



PLATE UUV, FIGS. 16, 83 (10?) ; AND PLATE XCV, FIGS. 6-8. 



In imi-t Edmondia PhUipi, Hall. Pi-eliiii. Notice Lamellibranchiata, 2, p. 90. 1870. 



•• " " " Pal. N. Y., vol. V, l>t. 1. Plates and Explanations: PI. 64, tigs. 9-18. 



1883. 

 Biirlingtoneitsis (Wiiitk and Whitkikld), Hall. Prelim. Notice Lamellibranchiata, 2, p. 



90. 1870. 

 " " •• Pal. N.Y., vol. V, pt. 1. Plates and Ex- 



planations : PI. 64, figs. 19-29. 1883. 



Shell of medium size, obliquely sub-rhomboidal ; length a little greater than 

 the height ; basal margin broadly curving. Po.sterior extremity sub-truncate, 

 abruptly rounded below. Cardinal line short, straight. Anterior end short, 

 sub-truncate. 



Valves of moderate convexity below, somewhat gibbous in the umbonal 

 region. 



Beaks sub-anterior, prominent, oblique, rising above the hinge-line and 

 incurved. Umbonal slope prominent, obtusely sub-angular above, and merg- 

 ing into the general convexity before reaching the post-inferior extremity. 



Surface marked by fine concentric striae, which are more or less fascicu- 

 late, producing varices of growth. 



Four specimens measure respectively 19, 20, 27 and 30 mm. in length, and 

 16, 19, 22 and 26 mm. in height. 



This shell is distinguished by its oblique form and sub-truncate extremities. 

 In some of its phases it more nearly resembles E. Philipi than any other, but 

 the beaks are more oblique and more anterior, and the form is not so regularly 

 rounded. 



Formation and localities. In the Chemung group, at Rock creek, Hobbieville 

 and Painted Post, N. Y. ; and Mansfield, Pa. 



