b ANOMA. 



celain white, a brown streak behind the lips ; 

 aperture oblique; columellar margin notched 

 at the insertion; columella not truncate; 

 20x6.2 to 19x5.7 mm., with 7% whorls; 

 Westmoreland. A. n. simpsoni, no. 6a. 



cc. Keel rather blunt, the striae passing over it; 

 yellow or whitish, with a brown pink streak 

 behind the lips; aperture subangular below, 

 the columella lip hardly notched at the in- 

 sertion ; columella strongly truncate ; 18 x 6.9 

 with 6i/ 2 whorls to 19.5x6.5 with 7-7y 2 

 whorls. Mt. Diablo. A. fuscoldbris, no. 9. 

 2. No color-streak behind the lip ; pale yellow or white ; 

 finely plicate striate throughout, with the suture 

 somewhat crenulate; a strong basal angle defining a 

 small basal area. 



A. radiata, no. 10 ; A. flexuosa, no. 11. 



II. Back of last whorl very finely and densely striate or 

 nearly smooth, strongly tapering to the basal keel; 

 rest of the shell glossy and nearly smooth; shape 

 fusiform ; whorls 7-9, the last often with a white band 

 below the suture. 



1. Back of last whorl with one or two blackish-brown 

 bands on an opaque-white ground ; peristome white. 

 a. Peristome sinuous; length 18-20 mm. 



6. Early whorls blackish-brown, the last whorl 

 with two spreading or confluent bands of the 

 same color. A. levis, no. 12. 



Z>Z>. Spire pale yellow or gray- white ; last whorl with 

 a blackish band above the middle, and a short, 

 oblique one at the base ; a gray streak behind the 

 lip ; 19-20 x 6-6.5 mm. A. I. bicincta, no. 12a. 

 Spire opaque white, with some clear gray 

 streaks, and a band of the same above the suture, 

 becoming dark brown, and below the periphery 

 on last whorl; a pinkish streak behind the lip 

 and below the very strong keel ; 18-20 mm. long. 

 A. 1. unicincta, no. 12c. 



