A Monograph of the Cretaceous Lamellibranchia of England, Vol. 2 (Classic Reprint)

Excerpt from A Monograph of the Cretaceous Lamellibranchia of England, Vol. 2

Description. - Shell large, rather compressed, ovate, height greater than length; antero-dorsal margin straight, the remainder forming a regular curve. Anterior area deeply depressed. Apical angle apparently about Anterior ear small; posterior ear larger, with a few ribs.

Ornamentation consists of about 40 rather strong, narrow ribs, with rounded summits which, in places, are slightly tubercular. The ribs are closer together on the anterior part of the valves than elsewhere. The interspaces are much broader than the ribs, and are flat or slightly concave; they are marked by numerous fine, concentric ridges.

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