This large fossil gastropod specimen is a Sinistrofulgur sp. (related to the modern left-handed, Lightning Whelk). The tail tip end is broken, but is otherwise in very good condition. It has had a very light cleaning with a soft brush. It was were recovered from a Miocene-Pliocene deposit in the Bone Valley formation of south central Florida. It is approx. 2,000,000 to 23,000,000 years old.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. It weighs over 2.5 pounds and measures approx. 9 inches by 6 inches.