LAMELLIBRANCHIATA. 389 



Edmondia subovata, n. sp. 



PLATE LXIV, FIGS. 18, 19, 20, -.'6, 27, 28 (10, 21?) ; and PLATE XCV, FIGS. 9-12. 



In part Edmondia Philipi, Hall. Prelim. Notice Lamellibranchiata, 2, p. 90. 1870. 



" " " " Pal. N. Y., vol. V, pt. 1. Plates and Explanations : PI. 64, figs. 9-18. 



1883. 

 " " BwUngUmeiusix (White and Whitfikld), Hall Prelim. Notice Lamellibranchiata, 2, p. 



90. 1870. 

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



planations : PI. 64, figs. 19-29. 1S83. 



Shell from medium to large size, broadly elliptical ; length about one-third 

 greater than the height ; basal margin gently curving in the middle, more 

 abruptly curving toward either extremity. Posterior margin regularly 

 rounded. Cardinal line nearly straight. Anterior end large, regularly 

 rounded. 



Valves regularly convex, somewhat gibbous in the umbonal region. 



Beaks at about the anterior third, prominent and incurved over the hinge. 

 Umbonal slope gibbous above, not defined nor affecting the post-inferior 

 margin. 



Surface marked by fine, lamellose, concentric striae, which are unequally 

 fasciculate, sometimes making conspicuous varices of growth. 



Three specimens measure respectively 33, 35 and 46.5 mm. in length, and 

 22, 25 and 31 mm. in height. 



This species differs from E. Philipi in its broadly elliptical form and more 

 anterior position of the beaks, characters by which it may be readily distin- 

 guished. 



Formation and localities. In the Chemung group, at Philipsburgh and Hobbie- 

 ville, N. Y. ; and Mansfield, Tioga county. Pa. 



Edmondia transversa, n. sp. 



PLATE LXIV, FIG. 24. 



In part Edmondia BurlingUmensvi (Whitb and Whitfibld), Hall. Pal. N. Y., vol. v, pt. 1. Plates and 



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



Shell of medium size, rhomboid-elliptical ; length one-third greater than the 

 height ; basal margin straight in the middle, curving gently toward either 

 50 



