http://www3.bc.sympatico.ca/kerryw/creature/diverse.htm
http://www.vibrantsea.net/diversicolor25_hardy9.html
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/ddiversi.html
http://www.seaslugforum.net/factsheet.cfm?base=denddive
http://slugsite.us/bow/nudwk281.htm
http://www.medslugs.de/E/Pac-NE/Dendronotus_diversicolor.htm