Small to medium, smooth, orbicular shell. Ears equal. Flat valve has approx 22 narrow ribs and wide interstice, general flesh-coloured, somewhat darker in the grooves often with brown, green or lavender areas or blotches, sometimes slightly mottled. Convex valve rather ventricose, white, cream, orange or pinkish in colour with often light mottling in brown or lavender and also approx 22 but wide ribs, and narrower intercostal areas.