What are some great seashells to collect on Florida beaches?

Sanibel Island is the best place for shelling in all of Florida. You wouldn't believe how many shells are on the beach when you go. You can't just walk on the sand in bare feet, because all of the shells cut you and stuff. It's just amazing. You can find any shell you've ever dreamed of having. Just make sure you look inside the shells before you take them, as some are already taken. It's about 2 hours southwest of Orlando, right by St. Petersburg.