Sea Slugs (Opisthobranchia) - My Hawaiian Images
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I don't have a common name on this one, but I finally found out the species: it's Cyerce elegans. Much thanks to Pauline Fiene and Cory Pittman and their excellent Opisthobranch website-- http://www.seaslugsofhawaii.com/

nudibranchOpisthobranchiacyerce elegans