292 HAWAIIAN NESOPUPAE. 



in outline. Fully adult specimens have but 4% convex whorls. 

 The surface of the shell is more closely, finer and more evenly 

 striate. Length 1.38, diam. 0.95 ; apert. greatest length 0.55 mm. 



Molokai: Poholua (type loc.), 2,500 ft. elevation; Kamoku 

 and Kawela (Cooke) ; Ualapue (Forbes) ; Western ravine, 

 head of Kamalo (Cooke & Pilsbry). Type 11068, Bishop 

 Museum, paratypes 35150 Bishop Museum and 44728 A.N.S.P. 



This species is undoubtedly closely related to N. limatula 

 from which it is here considered as a separate species not only 

 by its geographical distribution but by its much smaller size, 

 form, etc. 



In an immature specimen with 3*4 whorls the shell is openly 

 perforate, lighter colored than in the adults. The embryonic 

 whorls, under the microscope, are very minutely and closely 

 granulose, the granules do not appear to be arranged in any 

 particular order. The delicate, slightly oblique striffi appear 

 rather abruptly at about l^ whorls. 



Specimens from the western ravine at the head of Kamalo 

 are somewhat larger : 



Length 1.55, diam. 1.05 mm. 



Length 1.5, diam. 1 mm. 



la. Nesopupa dubitabilis kaalaensis C. & P., n. subsp. PL 28, 

 fig. 13. 



Specimens from Oahu are very similar to N. dubitabilis in 

 size and form. They differ, however, in that adult specimens 

 are always furnished with a minute basal fold slightly sub- 

 columellar in position. This fold has not been observed in 

 specimens from Molokai. It is somewhat immersed, low, short, 

 lamella-like rather than nodular. 



Two gerontic specimens show considerable variation in their 

 lamella character. In the first there is a rather long, low swell- 

 ing between the two palatal plicae, and the parietal lamella is 

 continued nearly to the margin of the aperture, ending in a 

 low broad nodule. In the second there is a minute nodular 

 infraparietal lamella. 



An average adult measures: Length 1.45, diameter 0.97; 

 aperture, greatest length 0.92 mm. 



