392 PALEONTOLOGY OF NEW YORK. 



Surface marked by regular, coarse concentric strisB, which are sometimes 

 fasciculate, forming low undulations. Interior unknown. 



The specimen described has a length of 48 mm. and a height of 35 mm. 



This species differs from E. Philipi in its more elongate form, sub-anterior 

 beaks, longer hinge-line and coarser and more regular concentric strioB. 



The specimen fig. 31, plate Ixiv, from the conglomerate, near Olean, was 

 originally referred to this species, but it is apparently distinct, differing in its 

 smaller beaks, sub-angular umbonal ridge and more truncate posterior extremity. 



Formation and locality. In the Waverly sandstone, Licking county, 0. 



Edmondia ellipsis, n. sp. 



PLATE LXIV, FIG. S6. 



In part EdinondUi BtLrliiigtonensis (Whitk and Whitfibld), Hall. Pal. N. Y., vol. v, pt. 1. Plates 



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



Shell large, broadly elliptical ; length more than one-fourth greater than the 

 height; basal margin regularly curving, and recurved over the posterior 

 end without any abrupt change, and thence to the cardinal line. Cardinal 

 line straight, slightly declining posteriorly. Anterior end short, regularly 

 roimded. 



Valves moderately convex in the lower and posterior portions, becoming 

 gibbous above and in the umbonal region. 



Beaks sub-anterior, moderately prominent. Umbonal slope convex, not 

 defined. 



Surface marked by somewhat fine concentric striae, which are sometimes 

 elevated and lamellose, curving over the umbonal slope and joining the 

 cardinal line at a very small angle. 



The hinge preserves a linear cardinal fold or groove posterior to the 

 beaks. Other characters of the interior unknown. 



The specimen described has a length of 43 mm. and a height of 30 mm. 



This species differs from E. Philipi in its more anterior beaks and longer 



