“Arianta” Remondii Tryon, and “Galaxias” griseola and Berlandieriana, of Mexico, seem to connect this group with the next.
†† Band triple, colors strongly defined.
XIII Group. (Aglaia Alb. part.) Generally lower than group XII, and lip more expanded, umbilicus large or moderate, with revolving grooves, or smooth.
‡ Colors light, often palest below. Inhabit dry or treeless regions, from lat. 32° to 36°.
38 facta Newc. Wh. 5 to 5½, white, or brownish above, lip yellow, umbil. nearly covered; diam. *0.42, axis 0.22.
39 Gabbii Newc. Wh. 5, band margins and grooves obsolete; (unique, between 38 and 40;) diam. *0.40, axis 0.20.
40 rufocincta Newc. Wh. 5 to 6, pale brown, depressed, umbil. moderate, lip broad; diam. 0.50 to 0.85, axis 0.22 to 0.45.
41 Traskii Newc. Wh. 6 to 6½, like last, but umbil. larger, lip thinner, usually higher; diam. 0.90 to 1.00, axis 0.40 to 0.62.
42 Ayresiana Newc. Wh. 6 to 7, yellowish, paler below, strongly grooved, spire elevated; diam. *0.80, axis 0.55. “Santa Cruz I., Cal.” Newcomb coll.