Peanut worm. Small bulbous body with extensible tubular introvert (burrowed into shell rubble in photo); length 5-12 cm (half of which is introvert); mouth at end of introvert partially surrounded by short finger-like tentacles; body covered with short conical papillae; color tan to dk. brown w. dk. brown or purplish spots.
Abundant under rocks, among mussels, holdfasts, roots of surf grass, or nestled in crevices; mid- to low intertidal zones & subtidal; protected outer coast; deposit feeder.Geo Range: Alaska to Baja