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Let me quote IPN on Plocamopherus tilesii at page 106: "Translucent yellowish body color, homogenously speckled with regular black and white spots. Oral veil margin yellow with black oral tentacles. Three pairs of short lateral appendages, with the last two pairs having a prominent white global structure." Reference:
Gosliner, Terrence M., David W. Behrens & Ángel Valdés. 2008. Indo-Pacific Nudibranchs and Sea Slugs. Sea Challengers Natural History Books.
Gig Harbor, Washington. 426pp.
Very similar is Plocamopherus cf. tilesii which differs by the transcendent body colour, covered with brown and yellow spots, by the long branched whitish velar appendages, and by the colour of the rhinophores: transcendent with a white median core and an orange outer third.
More information on Plocamopherus tilesii are on Bill Rudman's Sea-Slug Forum!