Family Ungulinidae

Shell size to 17 mm; shell sub-circular, lucinid-like, but considerably inflated. Sculpture of very fine concentric and radial lines. Umbo small but well defined. Inner surface of valves sometimes with opaque spots. Color white.

Shell size to 10 mm; shell rounded, smooth inside and outside, sculpture of irregular commarginal lines. Shell in photos collected by Susan J. Hewitt on Blind Pass in December 2014.