Intertidal Invertebrates of the Monterey Bay Area, California

Compiled & photographed by Gary McDonald, Long Marine Laboratory, University of California, Santa Cruz

Description: Ground color translucent greyish-white. An irregularly broken band of opaque white occurs dorsally on edge of foot. Occasional individuals have a pale orange spot dorsally on head. Cerata arranged in 9-12 or more transverse rows, tipped with opaque white and bear a subterminal band of rich brown which grades into yellow below; cores deep olive-green to brownish-green. Oral tentacles translucent greyish-white encrusted with opaque white. Rhinophores pale yellow-green distally, with 8-11 complete annuli which alternate with more or less incomplete annuli which occur on posterior face of clavus. Foot corners somewhat elongated.
Size: Typically about 25mm in length.
Notes: A very rare species.