http://www.gastropods.com/8/Shell_14168.shtml
http://www.seaslugsofhawaii.com/species/Limacina-trochiformis-a.html
http://www.nmr-pics.nl/Limacinidae/album/index.html
http://species-identification.org/species.php?species_group=pelagic_molluscs&menuentry=soorten&id=287
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