Here are a few of the Nummulite fossils from my collection:
The ancient Egyptians used nummulite shells as coins. It is not surprising then that the name "Nummulites" is a diminutive form of the Latin nummulus meaning "little coin".
here are a few sand dollars to go with them.
I haven't gotten around to making wampum from other shells around here, but I'd like to give it a try sometime.