http://slugsite.us/steve/steve6.htm
http://slugsite.us/steve/steve29.htm
http://www.sas.upenn.edu/African_Studies/Wildlife_GIFS/Chromodoris_12732.gif
http://slugsite.us/bow/nudwk133.htm
http://www.biology.ucsc.edu/people/potts/lonhart/Polycera.html
http://www.seaslugforum.net/showall/polyatra
http://www.vibrantsea.net/atra36_channel3.html
http://www.medslugs.de/E/Pac-NE/Polycera_atra/Selection.htm
http://www.photolib.noaa.gov/htmls/libr0435.htm
http://www.underwaterkwaj.com/nudi/california/c021.htm
http://smg.photobucket.com/albums/v109/divinman/Nudibranch%20archive/?start=80
http://scottpenny.smugmug.com/gallery/3881249_R9eMK/6
http://www.nudipixel.net/species/polycera_atra/