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Dr. Richard C. Willan identified this specimen, thanks!
This species was posted on 03 June 2004 at these websites as Platydoris speciosa (Abraham, 1877) [Doris],
Dorgan et al. (2002) show Platydoris speciosa (Abraham, 1877) [Doris] to be a junior synonym of Platydoris ellioti.
Reference: Dorgan K.M., Valdés Á. & Gosliner T.M. (2002). Phylogenetic systematics of the genus Platydoris (Mollusca, Nudibranchia, Doridoidea) with descriptions of six new species.
Zoologica Scripta 31 (3): 271-319
More information on Platydoris ellioti are on Bill Rudman's Sea-Slug Forum!