I Genus Binneya Cp. Ear-shaped, nearly flat, one-third the length of animal, spire none, corneous.
1 notabilis Cp. Whorls 2, pale brown, first with 30 delicate revolving ribs, epidermis expanded; diam. *0.46, alt. 0.12 in.
II Genus Vitrina Drap. Depressed subglobose, last whorl very large, swollen, imperforate, shining.
2 Pfeifferi Newc. Wh. 3, greenish white, suture finely margined, columella arched, spire flattened, diam. *0.19, axis 0.09.
Subfam. Helicellinæ. Shell thin, translucent, whorls 4 to 6, mouth moderate, surface smooth, pitted below or perforated.
III Group. Hyalina Feruss. Depressed globose, moderately umbilicate, or pitted, vitreous, shining, whorls uniform.
3 Breweri Newc. Wh. 5, pale corneous, umbilicus large, suture slightly channeled, aperture lunar; diam. *0.20, axis 0.10.
IV Group. Macrocyclis Beck. Discoid, widely umbilicate, growth lines often coarse, last whorl usually deflexed.
4 Newberryana W. G. Binn. Wh. 6, reddish-brown, flattened, mouth not deflexed, fine revolving striæ; diam. 1.43, axis 0.50.