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These beautiful "slugs of the sea" are my favorite creature to find. They tend to be much smaller than the picture suggests.
Usually on rocks, eel grass, mud. Depth range 20 ft-60 ft.
Feeds on small snails such as Margarites pupillus and Lacuna carinatus by cracking the shells with its jaws. Also feeds on sea anemones, hydroids, tunicates, and bryozoans. Their egg mass contains about 350,000 eggs.