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Polygyra sp.
It must be one of the most common snails in Florida, yet this is probably the first time I have ever seen one out of its shell.
Most dirt and long grass in a suburban yard
One of the two Flatcoil snails shown here, though I don't know how to tell them apart.
http://www.jaxshells.org/728aaa.htm
Seems to have a very swollen eye stalk too. Could be a parasite or other problem.