198 AMASTRA, OAHU. 



whorl, where there is a thin outer layer of russet cuticle, more 

 or less deciduous in front, and worn off before the aperture. 

 Behind the lip the cuticle becomes much darker, dark reddish- 

 brown with some blackish streaks. The interior is in color 

 between rose and lilac, and the lip commonly has a black line 

 at the edge. The last half of the last whorl is flattened periph- 

 erally and turgid a little distance below the suture. 



Length 19.3, diam. 9, aperture 8.2 mm. ; whorls 6y 2 . 



Length 18.1, diam. 8.9, aperture 8 mm., whorls 6%. 



Length 17.1, diam. 8.5, aperture 7.5 mm. ; whorls 6y%. 



While this shell resembles A. variegata of the Waianae 

 range, at the opposite end of the island, it differs in the color 

 of the aperture and it does not have so many whorls. It is 

 hardly separable from A. tenuilabris, and in our opinion only 

 a race of that species. Its recorded range is discontinuous, 

 probably because of insufficient collections. A. seminigra, A. 

 rubens kahana and infelix inhabit the eastern range west of 

 the area of A. rubicunda, to which they are probably related, 

 differing chiefly in their colder coloring. Most rubicunda 

 have a particularly warm shade of chestnut. Specimens from 

 the western valleys are generally smaller than the types, with 

 the interior less deeply colored. 



Length 17.2, diam. 8.5 mm.; G 1 /^ whorls (Nuuanu). 



Length 16, diam. 8.3 mm.; 5% whorls (Kalihi). 



Length 15, diam. 9.2 mm.; 5% whorls (KaMhi). 



Figures 12 and 15 are from co-types. Pig. 14 is a Nuuanu 

 shell in the C. M. Cooke collection. 



38. A. LUCTUOSA (Pfeiffer). PL 33, figs. 12, 13. 



"Shell imperforate, dextral, oblong-conic, solid, striatulate, 

 a little shining, bicolored. Spire inflated-conic, apex acute; 

 suture crenu'lated. Whorls 6, the upper four black, nearly 

 flat, the penultimate pale, more convex ; last whorl about two- 

 fifths the 'total length, pale tawny above, blackish below the 

 periphery. Aperture a little oblique, sinuate-semioval, white 

 within. Columellar fold laminiform, subbasal, triangular; 

 peristome unexpanded, acute, black-edged. Length 16, diam, 

 8, aperture 7x3% mm." (Pfr.). 



