AA.
Length, 1.6 mm, typical 5-tooth form; palatals located on thickened ridge; lower palatal more deeply recessed, and often with a low spur extending inward, longer than the elevated portion of the lamella..
,
B.
8-tooth variation, with extra teeth including infraparietal, suprapalatal, and infrapalatal
C.
With raised, white crest behind lip
Notes:
Locality: A. MO, St.
Louis Co., 4 mi SW Ellisville, Rockwoods Reservation; B-C, MO, Barry Co.,
5 mi S. Cassville, near Roaring River St. Park.
Most lots have a mixture of the simple, 5-tooth form, and variations with extra teeth. In the Barry Co. lot, figured in B-C above, most individuals have the infraparietal tooth; in other lots, the infraparietal is never present.
References:
Pilsbry, 1948, LMNA pp. 886-889, fig. 477
2-3, 5-8
Hubricht, 1985, Dist. Nat. Land. Moll. E. US, p.
9, map 61