IX Group. Anguispira Morse. Large, rather heavy, subturbinate, strongly ribbed, grooved or striped, umbilicate.
19 Idahoensis Newc. Wh. 5, ashy corneous, very convex, 20 to 25 strong ribs on last whorl, fewer above; diam. *0.52, axis 0.45.
20 Cooperii W. G. Binn. Wh. 5 to 6, white, 1 or 2 brown distant bands or mottlings, fine revolving grooves; diam. 0.58 to 0.98, axis 0.35 to 0.37.
[34] 21 solitaria Say. Wh. 6, white to dark brown, 1 to 4 brown bands, or a var. (?) brown, with 1 pale band; diam. 1.00, axis 0.80.
22 strigosa Gould. Wh. 5, ashy to brown, usually 5 to 8 banded below middle, angled or carinate, revolving grooves; diam. 0.75 to 1.00, axis 0.28 to 0.50.
N.B. Nos. 13, 16, 18, and Group IX are found only east of California.
B. Shell with a distinct thickened lip.
Fam. Helicidæ. Epidermis thickish, opaque, colored, lip thickened, expanded, reflected or toothed. Large or moderate.
Genus Helix Linn. Form globose—conic to depressed carinate; umbilicus wide to very small or covered; lip thickened, sometimes a little expanded, and rarely tuberculate below, or continuous across body whorl. Color, (in our species) yellowish brown to black, with a darker band around the periphery and sutural region, generally margined on each side (at least when young) by a pale one.