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Top row photos (left to right) from: http://shellmuseum.org/imgs/swflshells/202/alba2.jpg,http://upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Coquina_variation3.jpg/220px-Coquina_variation3.jpg,
http://www.seashells.org/seashells/images/spinjewel.jpg,http://www.theshellshop.co.uk/sites/theshellshop.co.uk/files/imagecache/product_full/S-AFRICAN-HEART-COCKLE-GT-2.jpg
Bottom row photos (left to right) from: http://www.natgeocreative.com/comp/Y3/612/617561.jpg,
http://shellmuseum.org/imgs/swflshells/179/zebra.jpg,
http://www.okeefes.org/Photos_in_Phylogenetic_Order/Bivalves_II/dosinia_elegans_dsc_0384.jpg,
http://www.seashells.org/seashells/images/penshells.jpg
http://www.seashells.org/seashells/images/spinjewel.jpg,http://www.theshellshop.co.uk/sites/theshellshop.co.uk/files/imagecache/product_full/S-AFRICAN-HEART-COCKLE-GT-2.jpg
Bottom row photos (left to right) from: http://www.natgeocreative.com/comp/Y3/612/617561.jpg,
http://shellmuseum.org/imgs/swflshells/179/zebra.jpg,
http://www.okeefes.org/Photos_in_Phylogenetic_Order/Bivalves_II/dosinia_elegans_dsc_0384.jpg,
http://www.seashells.org/seashells/images/penshells.jpg