Carolina Mantleslug (Philomycus carolinianus Bosc, 1802)?

seen on the way to South Lookout, Hawk Mtn, PA (Sep 9, 2006)
swamps, floodplain woods
feed on fungi and lichens at night and during wet weather
http://www.carnegiemnh.org/science/mollusks/va_philomycus_carolinianus.html