BEEDE: UPPER PERMIAN RED BEDS. 151 



EDMONDIA CUMMINSI, n. sp. 



Plate VII, figures 4. 4a. 



Shell small, transversely elliptical, rather compressed lat- 

 erally. Relation of height ( hinge to ventrum ) to the length is 

 about 7i to 9 mm. Hinge comparatively straight, about three- 

 fourths as long as the shell, rounding into the anterior and 

 posterior outlines on either end, more rapidly on the anterior. 

 Beaks only moderately prominent, situated a little in front of 

 the middle, incurving forwards. Valves only moderately 

 convex. The cast of the platform beneath the beak is well 

 developed in the type specimen. The cast has only extremely 

 faint traces of the surface undulations impressed on the um- 

 bonal ridge. 



Dozier, Tex. ; rare. 



This species differs from E. rotunda, ante, in the length of 

 the hinge, less convexity of the valves, and somewhat more 

 appressed beak. 



CONOCARDIUM OKLAHOMAENSE Beede. 



Plate VII, figures, 2-2/. 



Conocardium oklahomaensis Beede. Inv. Pal. Red Beds, p. 6, pi. I, figs. 

 3-3c, 1902. 



Shell attaining moderate size, thick, and typically cono- 

 cardiiform. Anterior and posterior lengths of the shell about 

 equal, posterior abruptly truncated and then tapering to the 

 point of a long tube. The beaks are centrally located, the 

 carina very strong, angular, and oblique. The anterior por- 

 tion tapers gradually to the end of the shell, where it turns 

 somewhat downward and is abrubtly cut off. The posterior 

 ventral outline is decidedly sinuate. The surface of the an- 

 terior part of the shell is marked by very coarse radiating 

 costse, eight or ten, in an adult individual, and about a half- 

 dozen coarse concentric ridges, producing a very rough, can- 

 cellated appearance. The region of the carina is covered with 

 very fine concentric laminae, and the posterior side of it by 

 nearly equally fine radiating lines producing a fine cancella- 

 tion. There are also four to six radiating ribs on the posterior 

 side of the carina. Length, 17+ mm. ; height, 7 mm. 

 Whitehorse spring, Oklahoma; common. 



