The Alabaster Nudibranch, also known as the White-Lined Dirona or Frosted Nudibranch (Dirona albolineata) is a large (18cm) translucent species of nudibranch. Feeding on small crustaceans, snails, and bryozoans, it lives in the Eastern Pacific Ocean, all along the west coast of North America.
Fun fact: these guys can also be found with a distinct lavender colour, usually around Vancouver Island!