Padilla Bay National Estuarine Research Reserve. Hermissenda, Hermissenda
crassicornis, also known as the Opalescent Sea Slug, is found in a variety of
habitats including mud flats, rocky shores and wharf pilings. Its body is up to
80 mm long. Its dorsal surface has a single orange stripe and bright "electric
blue lines, but otherwise is variable in color. Kodiak to Baja California.