It's seems familiar to me, but I can't figure out what species or even genus this is.
There seems to be a golden patch on the notum just in front of the cerata. Maybe that patch is a caruncle (like in Janolus) or maybe it's actually the rhinophores, because the white tentacles with black markings seem more like oral tentacles than rhinophores.
Lastly, I've attached a large cropped photo of the head. Any ideas as to species?
Edited by BrianM, 05 January 2013 - 02:00 PM.