318 HAWAIIAN NESOPUPAE. 



bryonic, under the microscope, minutely granulose, the minute, 

 even, close striae appearing abruptly at about the middle of the 

 second whorl; last whorl large, saccate, tapering towards the 

 base and rounded about the margin of the perforation, ascend- 

 ing slightly and slowly near the aperture. Aperture scarcely 

 oblique, nearly perpendicular, irregularly truncate-ovate, 

 slightly flattened on the right margin and arched towards the 

 upper insertion. The lip insertions distant but somewhat con- 

 verging and united by a thin callus. Angular lamella puncti- 

 form, seated somewhat within the margin and united to the 

 outer lip by a very thin callus. Parietal lamella more im- 

 mersed, nearly perpendicular to the parietal wall, lamella-like, 

 high and short. Columellar lamella small, short, deeply 

 placed, nearly horizontal, the edge slightly slanting down- 

 ward. Lower palatal fold rather deeply placed, short, rather 

 high, lamella-like ; upper palatal, when present, not so deeply 

 seated, weak, low, almost punctiform. Peristome expanded, 

 the outer margin rather thin, the inner margin slightly thick- 

 ened. Length 2.15, diam. 1.5, aperture 1 mm. 



Oahu: Nuuanu Valley at Luakuha falls, type locality 

 (Cooke) Ahuimanu (Spalding). Type 11075 Bishop Museum; 

 paratypes 12559 Bishop Museum and 44695 A. N. S. P. 



This species is very closely related to P. kauaiensis ; it differs, 

 however, by the thinner and lighter colored shell ; the spire is 

 shorter and broader and the aperture is larger than in the 

 latter species; also, the membranous eostee are more distinct 

 and stronger. In P. oahuensis the upper palatal fold is re- 

 duced to a minute tubercle, hardly lamella-like in form. In 

 most of the specimens examined it appears to be entirely 

 lacking. 



This species has only been taken, so far as known, on damp 

 rocks at the sides of waterfalls. Its larger size and shorter 

 lamellae easily separate it from the various forms of P. new- 

 combi. 



17. NESOPUPA KAUAIENSIS Ancey. PL 29, figs. 5, 6 ; page 309, 

 figs. 9, 10. 



1 1 Shell sub-oblong, short, corneous-brown, obliquely wrinkled 



