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I'm kinda new to the world of shells, and I'd like to know what kind of shell this is. Found on the Atlantic side coast of Eleuthera, Bahamas.

Any and all help is appreciated. Thanks in advance!
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This is a juvenile specimen of Lithopoma phoebium, the long-spined star shell.  In older books you may find it listed as Astraea phoebia. On the second link below, 5'th specimen down, you will see a juvenile one similar to yours, though yours is even more immature than this one.

http://en.wikipedia.org/wiki/Lithopoma_phoebium

http://www.gastropods.com/3/Shell_323.shtml

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