Main photo, Four-colour Nudibranch - Godiva quadricolor, by Rafi Amar

Godiva quadricolor is found on the South African coast from the Cape Peninsula to East London, and is an aeolid nudibranch!

Above, by Gary Cobb and David Mullin

It grows between 35-58mm in length and lives at depths up to 20 m!

Above, by Gary Cobb and David Mullin

It feeds on anemones and transfers its stinging cells to the cerata on its back giving it protection from predators....

Above, via Science Photo Library

......It will also eat other nudibranchs!

Above photo, by Guido Villani

It has also been reported from the Mediterranean, off western Australia and West Africa (although the ones found in Australia differ in colour, and may be another species)

....Here it is laying eggs!

Above, photo by Guido Villani

Info via wikipedia, here, and here!

edit- I forgot to do the image pop out thing yet again