Zigzag scallop - 100 mm
Shell circular, inequivalve, lower valve strongly concave, upper valve flatter, slightly convex. Hinge with wing-like projections of equal size. Sculpture on upper (flat) valve of about 35 ribs and interspaces of about same width. Lower (deep) valve with about 20 less prominent ribs. Color tan to light-brown. Inner surface of lower valve white. Upper valve mottled with reddish-brown and dark-brown markings.
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