ANOMA. 7 



aa. Peristome thin and in a plane, not recurved at the 

 ends ; pale yellow or gray- white, with a black-brown 

 band above the periphery on back of last whorl, 

 and a waxen streak behind the lip; 14-15x5-5.3 

 mm. A. 1. concinna, no. 12&. 



2. Back of last whorl with a blackish band above the 



basal keel, and a gray or olive belt ascending above 

 the suture to the summit; peristome sinuous, both 

 the face and back deep rose-red. 



A. I. baltcata, no. I2d. 



3. Without black bands on the last whorl, but often hav- 



ing a snow-white band below the suture ; basal keel 

 short, strong near the lip. 



a. Shell dark, at least at the ends ; lip pink or rose. 

 &. A white band below the suture ; keel dark. 

 c. Length 16-19, diam. 6-6.2 mm., whorls 7-8. 



A. splendens, no. 13. 



cc. Length 17.5, diam. 4.66, whorls 9, the last rib- 

 striate behind. A. dohrniana, no. 15. 



&&. Merely a white line, or none, below the suture; 

 otherwise like splendens. 



A. s. rosealabris. no. 13a. 

 aa. Shell yellow or whitish, often pink tinted behind 



and on the lip. 

 5. An opaque-white band below suture. 



A. s. citrina, no. 136. 

 &&. Merely a subsutural line, or none. 



A. s. albida, no. 13c. 



4. Not banded; basal keel long, not abruptly becoming 



stronger near the lip, which is white; no distinct 

 subsutural white band; shell whitish or yellow, 

 with the last whorl white; small 13-15 mm. long; 

 aperture oblique, the insertions of the lip but little 

 retracted. A. alboanfractus, no. 14, and varieties. 



5. Basal keel very strong, whitish, at least a half whorl 



long; columellar lip deeply notched above; colu- 

 mella truncate; lip pink. 

 a. Shell dark brown at the ends; last whorl with a 



