AMASTRA, LANAI. 247 



fold, and often a very low, more oblique rudimentary upper 

 fold. 



Fig. 7. Length 15.8, diam. 7, aperture 6 mm. ; 7 whorls. 



Fig. 9. Length 15, diam. 6.5, aperture 6 mm. ; 6~y s whorls. 



64a. Var. obscura (Newcomb). PI. 17, figs. 10, 12. 



The form called A. obscura has been 'considered a synonym 

 of mccsta by Pease, Hartman and Sykes. It differs only in 

 being a little more slender. The figures represent shells re- 

 ceived from Newcomb. The brown or dull olive cuticle may 

 be merely streaked (fig. 12) or it may be mottled and marked 

 with angular lines (fig. 10). As in mcesta proper, there is 

 sometimes a keel visible above the suture on some intermediate 

 whorls. 



Fig. 12. Length 16.5, diam. 6.5, aperture 5.7 mm. ; 7 

 whorls. 



Fig. 10. Length 13.3, diam. 5.5, aperture 5 mm. ; 7 whorls. 



Length 13, diam. 5.2 mm. 



Length 12, diam. 5.8 mm. 



Newcomb gave no dimensions. His description follows: 

 " Shell dextrorsal, turrito-conical ; whorls 7, longitudinally 

 striated, rather convex, marginate superiorly ; suture slightly 

 impressed. Aperture small, ovate; columella subtortuous. 

 furnished with a spiral lamina ; outer lip acute, simple ; color 

 dirty fulvous, covered with a blackish-brown epidermis; the 

 upper whorls black. Island of Ranai." 



Var. longa Sykes. PL 26, fig. 15. 



" Shell dextral, long, subperf orate, solid, substriate, cov- 

 ered with a black-brown epidermis; the apex rather acute; 

 suture simple. Whorls 7, moderately flat, the last more than 

 half the length of the shell. Aperture sinnate-semioval, whit- 

 ish inside; columella slightly folded above, provided with a 

 small transverse lamina; peristome simple, unexpanded. 

 Length 11.75, diam. 6.5 mm. 



" Lanai (Neweomb) ; Windward side of Lanai, apparently 

 extinct (Perkins). 



" This is one of those species which are fast disappearing 



