Keoki and Yukos' photo of an Orange Sidegill Sea Slug (Pleurobranchus sp.cf. peroni) which is uncommon under rocks in shallow water and tidepools. Rusty orange with closely packed tubercles. About 1.5 inches.
Orange Sidegill Sea Slug (Pleurobranchus sp.cf. peroni)
By Stan & Debbie Hauter, About.com Guide
Orange Sidegill Sea Slug (Pleurobranchus sp.cf. peroni)
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