You name the siphocypraea's aka cyprraea, cowries . There is so much controversy about fossil shell names and how to id them and some of them look so close as a look alike shells,so you id the cypraea's / cowries Florida is known to have the most pristine fossil shells in the world. We personally hand collected our shells many years ago and have been fossil collecting for more than 25 years and collected what we could, if we didn't collect all of these shells they would have been lost and gone forever, all of the pits are now full of water and are bass ponds and condos and with all the pits now have been closed to the following due to all trespassers / fossil hunting and clubs / fossil hunting clubs, a lot of the quarries are not even allowing the workers to collect anything and truck drivers could not leave their trucks while they were waiting to get loaded. Due to stricter Insurance rules etc... Whatever fossil collections that are out there, just please keep in mind, get the fossil shells while you can, these may be the last fossils that you could get for your collections or for study, If you want a fossil get it while you can. It may be your last chance.