http://slugsite.us/bow/nudwk228.htm
http://www.seaslugforum.net/showall/bullgoul
http://www.gastropods.com/2/Shell_12392.html
http://www.medslugs.de/E/Pac-NE/Bulla_gouldiana/Selection.htm
http://scottpenny.smugmug.com/gallery/3881249_R9eMK/2
http://www.nudipixel.net/species/bulla_gouldiana/
http://www.nmr-pics.nl/Bullidae/album/index.html
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