OXYSTYLA, SOUTH AMERICAN. 133 



ous, the basal one usually obsolete ; columella long 

 and straight. obductvs, p. 134 



c l . Smaller, regularly ovate-conic, the last whorl oval, 

 flammulate, varices few, ground-color yellow or 

 brownish, often with a light band below the per- 

 iphery, parietal wall generally chestnut, alt. 44-51 

 mill. 



d. Stripes numerous^narrowsmd regular ; 3 bands. 



pulchella, p. 135 

 d l . Stripes wide, irregular 



pulchella v. prototypus, p. 137 



c 2 . Ovate-conic, isabelline with pale blackish streaks 

 and three narrow, interrupted brown bands ; no 

 dark parietal callus ; alt. 49 mill.; Peru. 



isdbellina, p. 142 



tf 3 . Ovate- or oblong-conic, with the cuticle thin or 



wanting ; white or pinkish, with narrow, straightish 



streaks and several varices ; usually 3-banded 



(rarely with wide stripes). maracaibensis, p. 137 



c 4 . Similar, but obscurely angular at the periphery. 



fulvescens, p. 141 



A. 1 Longest axis of aperture less than half the length of the shell ; 

 columella with an oblique fold above ; form stout ; thick and 

 solid, smoothish, the columella, parietal wall, and a wide in- 

 ternal lip-border blackish. mars, p. 143 

 -4 2 . Longest axis of aperture less than, or about equal to, half the 

 length of the shell ; columella convex in the middle or straight. 

 b. Strongly striated spirally, granulose. bensoni, p. 147 

 b [ . Spiral striae slight or wanting. 



c. Columella convex, black ; irregularly streaked and 

 spirally banded ; diameter less than half the alti- 

 tude ; Bolivia. phlogera, p. 145 

 c 1 . Columella pale-edged ; cliam. less than half the alt. 

 d. Alt. 70, diam. 30 mill.; spire with 2 or 3 

 articulated bands, wanting on last whorl ; 

 Peru. macandrewi, p. 147 

 d. 1 Alt. 52, diam. 23 mill.; with narrow, nearly 

 straight and close stripes throughout ; no 

 bands; Ecuador. pfeifferi, p. 146 



