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Top Row photos (left to right) from: http://www.gastropods.com/Shell_Images/S/Strombus_alatus_1.jpg, http://www.kscience.co.uk/as/module5/seashore_web_site/organisms/images/rough_periwinkle.jpg, http://www.mitchellspublications.com/guides/shells/articles/0001/01-image.jpg, http://www.iloveshelling.com/blog/wp-content/uploads/2012/05/thailand-auger-shells.jpg,
Bottom Row photos (left to right) from:
http://shells.tricity.wsu.edu/ArcherdShellCollection/Images/Vermicularia_fargoi.jpg, http://www.dnr.sc.gov/marine/sertc/images/photo%20gallery/olive.jpg,http://www.shellmuseum.org/Shells2/sinistrum2.jpg
Bottom Row photos (left to right) from:
http://shells.tricity.wsu.edu/ArcherdShellCollection/Images/Vermicularia_fargoi.jpg, http://www.dnr.sc.gov/marine/sertc/images/photo%20gallery/olive.jpg,http://www.shellmuseum.org/Shells2/sinistrum2.jpg