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tim d, December 17, 2009 in Critter Identification
Right phylum, wrong group. It's not a nudibranch, it's a pelagic snail called a heteropod. You can read more about them at http://tolweb.org/Carinarioidea. I don't know enough about them to say what's going on here -- maybe those yellow masses are everted internal organs or maybe they're something else. I'll ask a friend.
Where did you take the photo?
I took the photo in Seattle at Seacrest Cove 2.