This is a lot of two (2) fossil acorn barnacles (Chesaconcavus sp.) that was recovered from a Miocene-Pliocene deposit (approx. 2 to 23 million years ago) deposit in Florida's famous Bone Valley Formation.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing both of the specimens shown. Your purchase will include an ID label.