can someone ID what this is?

[lpsreefer]

http://i1098.photobucket.com/albums/g373/mattjoly85/IMG00179-20110423-1841.jpg
any ideas?

[reeferious]

fossilized jaw from baby raptor have one just like it in my dinosaur bone collection

[nlreefguy]

Looks like some kind of mollusc. Do a search for "zig zag oyster" on google. Could be a juvenile of one of them (just a guess).