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unknown_shells
I have no idea what the name of these shells is, because the book they are from is written in Japanese. They are a subtle variation to the Spiral Cone Shells by Kawasaki-san. Folding that interior spiral can be quite troublesome, but they are a pretty interesting looking variant on the shell theme. They are a little less "pure" than the Spiral Cone Shells, in that there is less symmetry, but they are still nice.