392 
PALAEONTOLOGY OF NEW YORK. 
Surface marked by regular, coarse concentric striae, which are sometimes 
fasciculate, forming Ioav 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 striae. 
The specimen fig. 31, plate lxiv, 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. 25. 
Iii part Edmondia Burlingtonensls (White and Whitfield), Hall. Pal. N. Y., vol. v, pt. 1. Plates 
and Explanations: PI. 64, figs. 19-29. 1SS3. 
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 
rounded. 
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 
