Sand dollars

The term sand dollar (also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. (Related animals include other sea urchins, sea cucumbers, and starfish.) *-Everipedia

Currency

Sand dollars and various shells were used as currency by the indigenous Americans for many years, hence the name sand dollar. Today certain varieties sell for $1-15.

Percebu, Mexico

Taken with my iphone