Hi Folks,
was going through some images after transferring to Lightroom catalog and found this image of a Nudibranch,
family Polyceridae.It may be a Thecacera pennigera that has no black spots only orange. My other wild guess
was a variation of Paliolla cooki. Any ideas?

Unknown Nudibranch. by JimSwims, on Flickr
Found on night dive at Blairgowrie Marina, Victoria , Australia; depth 4-5m.
Cheers,
Jim.
Although from PNG, this critter is very similar:
http://slugsite.us/bow2007/nudwk684.htm
Cheers,
Marli
Thanks Marli that looks on the money. Wish I had taken more shots of it now as mine is out of focus and in a retracted state.
Those Thecaceras seem to really get around must be the "wings". 
Cheers,
Jim.