2l8 



NEW YORK STATE MUSEUM 



the surface is gently depressed making a distinct sinus in the 

 lower margins specially on the left valve. Anterior margins 



M o di om o rp h a impar 



relatively narrow and blunt, posterior extremity broadly rounded. 

 Postumbonal slope gently concave. Surface covered with regular 

 concentric lines. 



Lower Devonic. Dalhousie, N. B. 



Modiomorpha odiata nov. 



Shells elongate, depressed convex and of considerable size; beak 

 at the anterior third, hinge short, anterior curvature relatively nar- 



Modiomorpha odiata 



row, the valves widening backward in a low very broad curve, 

 umbonal ridge low but clearly defined making a flat or depressed 



