Answer by
Binome (1975)
If the shell is a segmented chitinous exterior, you're probably looking at a centipede or millipede. If the shell is a lump on it's back, it's a snail. If you're in Florida, it's almost certainly a millipede. Millipedes are slow and only eat plant matter, so they can't hurt you. Snails can't either. Centipedes have venom and sometimes bite, though.