July 27, 2007
From: Clinton Bauder
Also found this animal which I also believe to be Eubranchus rustyus. They are slightly different from the other example in that the distal end of the cerata seem to have a red tip on them rather than white. These shots also show the egg mass.
These animals were about the same size as my other example and on the same kind of hydroid and were within a few meters of the first on the reef.
Locality: Pfieffer Point, 20 meters, CA, USA, Pacific, 21 July 2007, Rocky Reef. Length: 3 mm. Photographer: Clinton Bauder.
Bauder, C., 2007 (Jul 27) Eubranchus rustyus  from California. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20296
I agree again. I think what we are seeing here is simply variation. Great to have the eggs.
Again, thanks for sharing,
In a recent message [#19058] I mentioned how caprellid amphipods can displace aeolids from hydoid colonies. I am not sure what the photo alongside indicates but I thought it worth mentioning that the whole 'branch' on the left of the photo is covered in caprellids.
Bill RudmanBehrens, D.W., 2007 (Jul 27). Comment on Eubranchus rustyus  from California by Clinton Bauder. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/20296
Eubranchus rustyus from British Columbia
From: Clinton Bauder, September 12, 2007
Eubranchus rustyus from California 
From: Clinton Bauder, July 27, 2007
Eubranchus rustyus from central California
From: Jeff Goddard, August 31, 2006
Eubranchus sp. from British Columbia
From: Marli Wakeling, January 25, 2006
Eubranchus rustyus? from British Columbia
From: Paul Sim, October 20, 2003
Eubranchus rustyus from Channel Ids, California
From: Bruce Wight , August 8, 2003