this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/dsubramo.html
http://www.seaslugforum.net/showall/dendsubr
http://slugsite.us/bow2007/nudwk557.htm
http://www.medslugs.de/E/Pac-NE/Dendronotus_subramosus/Selection.htm
http://smg.photobucket.com/albums/v109/divinman/Nudibranch%20archive/?start=40