Well, you know this one... I scanned it for it's the most perfectly preserved one that I was able to find under the sea... I scanned both front and back (upper side and lower side, perhaps) of the same shell (infact, 'test' as I've learned right now from the book "Shell" of "Eyewitness Guides" serial of "Dorling Kindersley, London", a book that was the gift of a British friend who knew my enthusiasm for sea shells)...