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Phyllidia coelestis  Bergh, 1905

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Phyllidia coelestis is characterized by the "Y" shape of the blue-grey dorsal ridges, the yellow-capped mid-dorsal tubercles never forming a median ridge and the broad blue-grey mantle margin. Phyllidia coelestis has no dark stripe on the uniformly blue-grey foot sole.
Pretty similar is Phyllidia varicosa which has tubercles forming many longitudinal ridges, yellow-capped tubercles at the mantle margin and a dark longitudinal stripe on the blue-grey foot sole.
More informations on Phyllidia coelestis are at Bill Rudman's Sea-Slug Forum!