Publisher's Synopsis
Excerpt from Fauna From the Eocene of Washington
Description. - Shell large and rectangular in outline; nearly equilateral; beaks prominent, umbonal area broad; hinge line straight; cardinal area narrow; dorsal line sloping slightly from the beaks; anterior end rounded, passing into the ventral margin with a curve; ventral margin only slightly curved, extending abruptly into the posterior end; posterior end straight; posterior end is more flaring and concave than the anterior end; there is a tendency for a slight umbonal ridge to extend from the beaks to the posterior ventral margin; shell ornamented with 22 flat-topped, wide, very prominent radiating ribs with inter spaces nearly equal to the width of the ribs.
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