174 AMASTRA, OAHU. 



being reddish-brown in the spire or throughout, or the last 

 whorl may be almost white under the cuticle. The general 

 tone is therefore quite variable, but the pale yellow tint gen- 

 erally predominates on the last whorl. Sometimes it is varie- 

 gated with narrow spiral bands of olive-yellow and brighter 

 yellow. These approach the reticulata type of coloring. 

 There is almost always a narrow pale band below the suture. 

 The embryonic whorls are very finely, rather sharply striate. 

 the last one generally having the striae interrupted by spiral 

 lines. The later whorls have coarse wrinkle-striaa, usually 

 cut by spiral incised lines, but these may be very weak, or 

 even scarcely perceptible. The interior is white or pale flesh- 

 tinted; and the lip has a strong white callous rib within. 

 The parietal callous is thick and opaque. Lihue shells (fig. 

 23) measure: 



Length 16.1, diam. 9, aperture 8 mm. ; 6% whorls. 



Length 13.8, diam. 8.2, aperture 7 mm. ; 5^2 whorls. 



In Nuuanu shells (pi. 30, figs. 21, 22) the cuticle is stronger 

 than in those from the Waianae range ; color a rather bright 

 yellow, sometimes with interrupted or stippled whitish 

 bands ; upper whorls of the spire dull red-brown as usual. A 

 shell normal in shape and a very long one are figu-red. 



A. albolabris is related to the much darker and smoother A. 

 textilis, but it also has characters of the more typical forms 

 of the reticulata series, as shown by the occasional develop- 

 ment of a variegated coloration, the spiral incised lines and 

 rather strong striation of the later whorls, reminding one of 

 A. venusta, which is perhaps its nearest relative. 



19. A. SUBROSTRATA (Pfeiffer). 



"Shell imperf orate, dextral, ovate-conic, solid, irregularly 

 striate, a little shining; brown, clouded with tawny. Spire 

 swollen-conic, the apex rather acute. Whorls 6, the first 4 

 scarcely convex, the last rounded, about two-fifths the total 

 length. Columellar lamella nearly basal, acute, oblique. 

 Aperture slightly oblique, irregularly semieiliptieal, angular 

 at the columella, as if extended into a sort of beak. Peri- 

 stome unexpanded, white-lipped within, the right margin 



