HAWAIIAN NESOPUPAE. 321 



indicated by a low indistinct swelling; parietal lamella strong, 

 deeply seated, slanting outwards; columellar lamella strong, 

 deeply seated, slanting downwards, the inner end abruptly 

 turned upwards, following the columella as a thickened 

 rounded ridge ; two palatal folds rather short, parallel when 

 seen through the shell from the back, rather remote from the 

 peristome, of almost equal size. Peristome with a uniform 

 whitish thickening within, the margin expanded, thin, of the 

 color of the shell. Length 1.57, diam. 0.9, aperture (diag.) 

 0.58 mm. 



Oahu : Kaliuwaa, on the rocky walls of the canyon, near the 

 waterfall (Cooke) ; West Maui ; Honokaliau (Forbes). Type 

 11077 Bishop Museum; paratypes 19842 Bishop Museum and 

 44697 A. N. S. P. 



This species is separated from newcombi by its narrower 

 outline, lighter color, circular mouth and the almost complete 

 absence of an angle lamella. It is rather remarkable that 

 the only two known colonies of this species should be from 

 different islands. The species seems to be abundant where 

 found, as 36 specimens were taken at Kaliuwaa and 13 at 

 Honokahau. The Maui specimens are slightly larger with 

 more convex outlines, and are darker-colored, with slightly 

 more numerous and stronger developed membranous ribs than 

 those from Oahu. One measures : length 1.56, diam. 0.95, 

 a pert, (diag.) 0.67 mm.; 4% whorls. 



19. NESOPUPA ALLOIA C. & P., n. sp. PL 29, fig. 10. 



The shell is very minute, perforate, shortly ovate, isabella 

 color, thin, slightly translucent, scarcely shining, marked with 

 thin, distant rather high membranous eosta? (about 19 on the 

 last whorl), the inter-costal spaces minutely granulose- 

 wrinkled. Spire short, summit convely conic, the individual 

 whorls convex, separated by a deep suture. Whorls 4, the 

 first minutely granulose and very faintly spirally striate, the 

 oblique, delicate riblets beginning at about the middle of the 

 second whorl ; the penult whorl is closely costulate, swollen ; 

 the last whorl convex, tapering towards the base, scarcely 

 ascending near the aperture. Aperture rather large, truncate- 



