p.2

Cardita borealis, Conrad. Am. Mar. Conch. p 38 pl. 8 fig. 1. DeKay Nat. Hist. N.Y. p. 204 pl 22 fig 247

Shell very thick & robust, suborbicular, heart shaped; beaks elevated and recurved; from 18 to 20 radiating ribs, broader than their distances apart, and strongly crenulating the outer margin; ligament scarcely concealed; lunule deeply impressed; a small triangular tooth in the left valve, with a long grooved and oblique one along the margin; in the other valve a long oblique tooth occupying the pit between the teeth of the left valve and a smaller one near or upon the ligament.

L [illegible] H 1.0 D 0.8