http://slugsite.us/bow/nudiwk39.html
http://slugsite.us/steve/steve14.htm
http://www3.bc.sympatico.ca/kerryw/creature/3line.htm
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/ftriline.html
http://www.medslugs.de/E/Pac-E/Orienthella_trilineata/Selection.htm
http://www.metridium.com/monterey/nudibranchs/trilineata.html
http://www.seaslugforum.net/showall/flabtril
http://www.vibrantsea.net/trilineata2_benitos1.html
http://www.medslugs.de/E/Pac-NE/Orienthella_trilineata/Selection.htm
http://www.underwaterkwaj.com/nudi/california/c013.htm
http://www.seaotter.com/marine/research/flabellina/trilineata/html/trilineata.jpg.html
http://smg.photobucket.com/albums/v109/divinman/Nudibranch%20archive/?start=80
http://scottpenny.smugmug.com/gallery/3881249_R9eMK/4
http://www.nudipixel.net/species/flabellina_trilineata/
http://marliwakeling.jalbum.net/Nudibranchs/slides/Flabellina trilineata.html
http://www.dragonmouse.com.au/diving/nudibase.php?action=nudidetail&id=85