Diagnosis. Small, 10-15 mm (rarely to 20 mm); valves uniformly colored or mottle with reddish-brown, or orange tones, rarely cream; central areas finely pitted, radial areas with rows of fine (often obsolete) granules; girdle scales very small, with faint striations. Habitat. On large cobbles, pebbles and dead bivalve shells, lowest intertidal to 1460 m. Distribution. Cook Inlet, Alaska to southern Baja California Sur.
Occurrence. Very rare to uncommon intertidally, uncommon to common below 15 m. Comments. This species is frequently dredged in deeper waters.