http://slugsite.us/bow/nudiwkps/nudiwk5.html
http://slugsite.us/bow/nudiwkps/nudiwk35.html
http://slugsite.us/steve/steve23.htm
http://slugsite.us/steve/steve22.htm
http://www3.bc.sympatico.ca/kerryw/creature/iris.htm
this website exists no more:
http://www.biology.ucsc.edu/classes/bio161l/NUDI/diris.html<
http://www.crl.com/~divrdan/iris.html
http://www.crl.com/~divrdan/dendro_face.html
http://www.crl.com/~divrdan/dendro_far.html
http://www.metridium.com/monterey/nudibranchs/iris.html
http://www.medslugs.de/E/Pac-NE/Dendronotus_iris.htm
http://www.seaslugforum.net/factsheet.cfm?base=dendiris
http://slugsite.us/bow/nudwk380.htm