Photo by Matt Hubball - species unknown or not named, in his album In album: Coron, Palawan, Philippines at Webshots - more awesome pics. Nudibranchs - of which there are at least 3,000 named species are also known as sea slugs ... remind me of some leading politicians. This one for some reason brings Tessa Jowell to mind.
Also Nick Hobgood's stunning East Timor Underwater Wonderland " a nudibranch grazing"
This looks like a Rasta slug ..Lee Jasper maybe ?