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Family Strobilopsidae
Strobilops labyrinthica(Say) 
Shell dome-shaped with strong axial ribs,color chestnut brown,umbilicus small.
Diameter 2.3 mm and height 1.8 mm.
On dead leaves in humid forests.
In Canada and Maine to Georgia and west to Kansas and Arkansas.

Strobilops aenea(Pilsbry) Shell low dome-shaped with a keel,dark brown with a reddish golden tint. Diameter is 2.5 mm. In Canada to Florida.

Images courtesy of Larry Watrous