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The identification of this specimen was confirmed by Bill Rudman with the words: "This is quite possibly Goniodoris felis".
The are many pictures of this species from Japan, (the type localty) online which fit Baba's drawing and look pretty different!
More information on Goniodoris felis are on Bill Rudman's Sea-Slug Forum!
How to cite:
Köhler, E. (2017), published 2 July 2017, Goniodoris felis Baba, 1949
available from https://www.Philippine-Sea-Slugs.com/Nudibranchia/Euctenidiacea/Goniodoris_felis.htm