Weekend Nudi

Here's a slightly different nudibranch to the norm, (compare and contrast with these), in that it isn't comedically brightly coloured:

I'm told its Plakobranchus ocellatus, and it also differs from the norm in having no obvious gills (the frilly top bit) and in having a sort of hammerhead configuration for its rhinatophores (the horn bits).

Here's a picture showing both its ideal habitat and mine: