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Melibe leonina, common names the "hooded nudibranch" or the "lion's mane nudibranch", is a species of predatory sea slug, specifically a nudibranch, a marine gastropod mollusk in the family Tethydidae.
Found on eelgrass and other seaweeds near low tide and below, and in kelp forest in deeper water.
There were a number of them floating around - tide was coming in at the beach.