Polybranchia sp.  Genus: Pease, 1860

http://www.seaslugforum.net/showall/polybsp1
http://www.underwaterkwaj.com/nudi/sacoglossans/e548.htm
http://www.nudipixel.net/species/polybranchia_sp/
http://www.umiushi-zukan.com/eng/list_pic.php?ssw=g&kind_id=1194
http://slugsite.us/bow2007/nudwk922.htm