What are these shells - and piece of coral?

[paul monfils]

Hi,

Do you know where these were collected?  Florida perhaps?  Locality is important because similar looking species often live in different geographic areas.  And the fact that these shells are quite eroded makes definite identification that much more difficult.  If you don't know where they are from, I'll give it my best shot, assuming Florida/Caribbean.  Also, I don't see the second picture you refer to.

Paul M.