268 PALEONTOLOGY OF NEW YORK. 



Modioli (Mytilops) metella. 



PLATE XXXIII, FIGS 13 U; IND PLATE LXXXVII, FIG 



1 ' ! • i ■ I Shell 



I i Pal. N. Y.. vol. ..)■(. I. Plates and Explanations : PI. 33, tigs. 23, 24 



Shell large; body narrow elliptical, sub-arcuate, obliquely truncate mi the 

 anterior dorsal side : length more than twice the height ; ventral margin 

 gently cursing, nearhj straight for three-fourths of the length, thence 

 abruptlj rounded at the posterior extremity; dorsal margin verj genth 

 curving to the extremity of the hinge-line. 



Valves equal, depressed-convex at the posterior end, becoming gradually 

 more convex to a point anterior to the middle of the length, and gibbous in 

 the umbonal region. 



Hinge-line oblique, about equal to the height of the valve. Beaks small, 

 appressed. 



Test thin, marked by concentric stria-. 



Ligamental area marked by two slender grooves. < Hher interior characters 

 unknown. 



A specimen has a length of 57 mm., height 25 mm., and hinge-line 24 mm. 



This species differs from M. pracedens in its larger form, which is less 

 expanded posteriorly, less angular and gibbous along the umbonal slope, and 

 without radii on the surface so far as can he determined in the specimens. 



Formation and localities. In a conglomerate of the Chemung group, at 

 Panama, and in a boulder of similar rock on the road from Ellington to Cherry 

 creek, Chautauqua county, N. Y.. and at Warren, Pa. 



