Nucella ostrina (Gould, 1852)
Phylum Mollusca, Class Gastropoda, Subcl. Orthogastropoda, Superorder Caenogastropoda, Order Sorbeoconcha, Infraorder Neogastropoda, Family Muricidae
Heavy, spiral shell to 30 mm w. slightly higher spire than N. emarginata; sculpturing varies from broad spiral cords & axial ribs to smooth; siphonal canal short; lacks parietal nub on the inner posterior margin of aperture; shell white, gray, brown or black.
Common, high to mid-intertidal zones, exposed & protected outer coast; drills into prey (mussels, limpets, barnacles) with radula.
Geo Range: Bering Sea to Pt. Conception, Calif.
Similar species: overlaps with southern Nucella emarginata betwn Halfmoon Bay & Pt. Conception; in zone of overlap, N. ostrina occurs in wave-swept areas; Nucella from Hopkins Marine Station south to Pt. Joe appear to be all N. emarginata with N. ostrina to the south & north.