Tylodina corticalis (Tate, 1889) [Umbrella]

http://www.seaslugforum.net/showall/tylocort
http://www.nudibranch.com.au/pages/6245.htm
http://www.bluering.org.au/Opisthobranchs-208.htm
http://www.nudipixel.net/species/tylodina_corticalis/
http://www.dragonmouse.com.au/diving/nudibase.php?action=nudidetail&id=138
http://www.medslugs.de/E/Pac-SW/Tylodina_corticalis/Selection.htm