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Medes Islands, Catalunya, Spain
I have never seen that kind of nudibranch here in Catalunya. I have a photo of eggs but they are different color.
I still think it may be this guy: http://cache2.allpostersimages.com/p/LRG...
I suggested him for you, do you have a picture of the whole mass of eggs?
Google Nudibranch Egg masses for the different ways that they lay eggs, It's truly amazing!