ID of this Nudi

I found this guy free swiming at San Miguel. It is some sort of Nudi or flatworm. I am sorry about posting a BW image, but my exposure and DOF were pretty dreadful. It is only viewable in BW. It was almost translucent so not much info was lost by dropping the color.

It's Melibe leonina. They're frequently found swimming - I don't know if they're swept away by currents or deliberately off exploring. They feed by capturing small crustaceans, jellies, fish, worms, etc. with the oral hood which is at the top of the picture. More about them at :

http://www.slugsite.us/bow/nudwk188.htm

http://slugsite.us/bow/nudwk406.htm

It's Melibe leonina. ...

Wow, that was quick! Thanks, I spent some time with my books, but I don't have a good one for invertebrates.