Sea Slugs (Opisthobranchia) - My Hawaiian Images
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I was pushing the limits of what my camera could do on this shot---but thanks to Cory Pittman I do know what this is: family Tethyidae, species is Melibe megaceras...and according to Cory this is the first photo of one taken on Maui. See this link for more information.

Tethyidaenudibranchmelibe megacerasOpisthobranchia