Answer: A gift from a scallop!

Almost certain that those are the gills of an oyster, but could be the mantle.
AH.com: Try again!
Posted by: M at November 1, 2007 11:04 AMA retainer?
AH.com: Yes! My retainer and mouth guard - oops, dropped on the floor!!
Posted by: Ricky at November 1, 2007 11:37 AMDinner
Posted by: name at November 1, 2007 1:26 PMThe innards of a deveined fresh shrimp?
Posted by: Kim C. at November 1, 2007 4:59 PMIs it too late to say "kiwi"?
Posted by: Jodi at January 3, 2008 11:17 AM