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Philippe Poppe identified it on 6 August 2012 as Staphylaea staphylaea (Linnaeus, 1758)
There are many pictures of Staphylaea staphylaea at Poppe-Images!
Within the family Cypraeidae are according to WoRMS 5 subfamilies with 49 genera and hundreds of species, I don't know how to distinguish them!
How to cite:
Köhler, E. (2016), published 3 November 2016, Staphylaea staphylaea (Linnaeus, 1758)
available from https://www.Philippine-Sea-Slugs.com/Look-alike/Cypraeidae/Staphylaea_staphylaea/Staphylaea_staphylaea.htm