456 
PALAEONTOLOGY OF NEW YORK. 
sub-central beaks, the ventricose valves, and in the undefined sub-angular umbo- 
nal slope. 
Formation and localitij. In a sandstone of the Chemung group, at Cold 
Spring, Napoli, Cattaraugus county, N. Y. 
SCIIIZODUS DEGENER, 11. Sp. 
PLATE LXIU, FIG. 17. 
In part Cardiomorpha rotunda, Hall. Pal. N. Y., vol. v, pt. 1. Plates and Explanations: PI. 63, 
fig's. 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. obtains by the sub-cen¬ 
tral position 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. 
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