336 PROCEEDINGS OF THE CALIFORNIA 



IX Group. Anguispira Morse. Large, rather heavy, subturbinate, 

 strongly ribbed, grooved or striped, umbilicate. 



19 Idahoensis Neux. 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, Qoe revolving grooves ; diam. 0.58 to 0.98, axis 0.35 

 to 0.37. 



(a) 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 be- 

 low 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. Helicidce. 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, some- 

 times 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. 



f Band triple in young and thin specimens, (wanting in varieties. 

 Bandless specimens of Nos. 24, 25, 27, 28, 33, have been noticed.) 

 Colors, uniform brown or olivaceous, sometimes mottled. Obliquely 

 reticulate grooved, or wrinkled-malleated. From forests of oak, etc., 

 in middle regions, or moderate elevations southward. 



X Group. (" Arianta" Albers, No. 23, " Polymita" Tryon, No. 

 24.) Form resembling H. pomatia, sculpture in zigzag or divari- 

 cate grooves. Subimperforate. 



23 Californiensis Lea. Wh. 5, yellowish-olive, thin, band pale-mar- 

 gined, sculpture faint, subglobose ; diam. 0.75 to 0.88, axis 0.56 to 0.62. 



24 redimita W. G. Binn. Wh. (4>£) b% to 6, reddish brown, band 

 single, umbil. small or none ; (var. of 25 ?) diameter 0.80, axis 0.48. 



XI Group. (Arianta and Aglaia part., auct.) Form much like 

 Arianta arbustorum, sculpture like last. Umbilicate. 



25 Nickliniana Lea. Wh. 6 to 7, yellowish-brown, oblique grooved, 

 wrinkled or malleated, umbil. small ; diam. 0.72 to 1.05, axis 0.42 to 0.80. 



26 Bridgesii Newc. (Not of Tryon, 1866.) Wh. 6, grayish corneous, 

 thinner, band broader, umbil. wider than 25 (a var.?) ; diam. *1.00, axis 0.73. 



27 arrosa Gld. Wh. n% to 7, brown, mottled yellow, (vars. yellow or 

 olive, bandless) wrinkled malleate ; diam. 1.10 to *1.60, axis 0.59 to 0.90. 



(a) The west slope specimens may be all of species 20. 



