Was it moving? It could very well have been a nudibranch like your friend is so fond of. That URL was http://www.seaslugforum.net. You could look through there for a positive ID but it will take you a while, to say the least. I do have a type of snail that has a white shell with black dots on it, but that doesn't really sound like what you're describing.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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