456 PALEONTOLOGY OF NEW YORK. 



sub-central beaks, the ventricose valves, and in the undefined sub-angular umbo- 

 nal slope. 



Formation and locality. In a sandstone of the Chemung group, at Cold 

 Spring, Napoli, Cattaraugus county, N. Y. 



SCHIZODUS DEGENER, n. Sp. 

 PLATE LXIII, FIG. 17. 



In pai-t Cardioinorpha rotmula. Hall. Pal. N. Y., vol. v, pt. 1. Plates ami Explanations: PI. 63, 



fijfs. 17-20. 1883. 



Shell large, very broadly elliptical ; length one-sixth greater than the height. 

 Basal margin broadly curving. Post-inferior extremity scarcely extended 

 beyond the general outline ; margin sub-truncate above. Cardinal line less 

 than half the length of the shell. Anterior end large, contracted below the 

 beak and broadly rounded below. 



Valves moderately convex in the lower and marginal portions, becoming 

 gibbous in the middle. 



Beaks a little anterior to the middle, large and prominent, rising conspicu- 

 ously above the hinge-line. Umbonal slope obtusely angular above, merg- 

 ing into the general convexity of the shell below the middle. 



Surface marked by fine concentric striae, which are obscurely preserved 

 in the cast. 



A specimen has a length of 40 mm. and a height of 33.5 mm. 



This species is distinguished from all others except S. oblatus by the sub-cen- 

 tral po-sition of the beaks, and also by the absence of an umbonal ridge at the 

 post-inferior extremity. 



Formation and localities. The specimen figured is recorded as coming from 

 the Chemung group ; locality unknown. A single imperfect specimen having 

 similar proportions is from the Chemung group at Lawrenceville, Tioga 

 county. Pa. 



