446 PALEONTOLOGY OF NEW YORK. 



Formation and localilies. In the upper members of the Chemung group, at 

 Warren, Pa. 



Paracyclas? pauper. 



PLATE LXXV, FIGS. 2»-28 ; AND PLATE XCV, FIG. 20. 



Cgtlierodon (Schizodus) pauper, Hall. Pal. N. Y., vol. v, i>t. 1. Plates and Explanations!: PI. 75, 



figs. 24-26. 1883. 



Shell small, sub-orbicular ; height nearly equal to the length. Margin regularly 

 curving from the distinct lunule to the post-inferior extremity, whence it 

 abruptly curves to the post-cardinal extremity. Cardinal line short. 



Valves moderately convex below, gibbous in the middle and above. 



Beaks at about the anterior third, somewhat prominent and arching for- 

 ward. Umbonal slope rounded, not strongly defined. 



Surface marked by fine concentric striae, which are partially preserved in 

 the cast. 



Three specimens measure respectively 15, 20 and 22 mm. in length, and 

 14, 18 and 20 mm. in height. 



The general aspect and form of the shell appear to ally this species with 

 Paracyclas, but its absolute relations are undetermined. 



Formation and locality. In the sandstone of the Chemung group, at Port- 

 viUe, N. Y. 



