Ocinebrina interfossa (Carpenter, 1864)

    Intertidal, Asilomar Beach, Monterey Co., California 5/7/2011 (about 20 mm.). Also pictured in the image are  Chlorostoma funebrale (A. Adams, 1855) and Garnotia adunca (G.B. Sowerby I, 1825). Digital image by Roger N. Clark.