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Dermatobranchus albus (Eliot, 1904) [Pleuroleura]

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Dermatobranchus albus is characterized by longitudinal low ridges and grooves, which are not parallel to the median line. The ridges are white and have a yellow crest. The grooves are darker translucent grey or yellow. The rhinophores bear longitudinal perfoliations, are white at the base, the main part is black, the tips are yellow/orange. The oral veil is white with a yellow anterior border.
Pretty similar are:
Dermatobranchus cf. albus which differs from Dermatobranchus albus by the missing of the broad black band at the rhinophores and by having no yellow crest upon the ridges, and
Dermatobranchus sp. 12 which differs by flat rounded tubercles, by an arch-sized diffuse brownish patch on the mantle, and lacks yellow/orange tips of the rhinophores.
More informations on Dermatobranchus albus are at Bill Rudman's Sea Slug Forum!