XV Group. (“Arianta.”) Toothless, umbilicus large, surface coarsely wrinkled or granulate, lip broad, reflexed.
49 Townsendiana Lea. Wh. 5½, to 6, mixed yellow and brown, body whorl coarsely wrinkled, fine revolving grooves; diam. 0.68 to 1.38, axis 0.35 to 0.55.[35]
50 anachoreta W. G. Binn. “Wh. 6, reddish ashen, granulated and sparsely indented;” diam. *1.00, axis 0.54.
XVI Group. Odotropis Raf. “Tooth upon columella, umbilicus covered.” Lower lip tuberculate, and a parietal tooth.
51 devia Gld. Wh. 6, brown or olive, no sculpture except distinct lines of growth; diam. 0.80, axis 0.45.
XVII Group. Aplodon Raf. One parietal tooth, (or none) perforate or imperforate, hirsute or smooth, lip simple.
52 Columbiana Lea. Wh. 5½ to 6, corneous brown, with or without hairs, umbilicate; diam. 0.50 to 0.70, axis 0.25 to 0.35. The small imperforate and toothed form usually classed with this species may better be considered a rounded var. of germana, the subangled form of which is very rare.
53 germana Gld. “Wh. 5½, reddish corneous, hirsute, subangled, one parietal tooth, imperforate;” diam. *0.30, axis 0.20.
XVIII Group. Triodopsis Raf. “Umbil. large, a tooth on each lip, and one parietal.” Sometimes hirsute, hairs deciduous.