284 HAWAIIAN NESOPUPAE. 



pression just back of its prominent outer end. The lower 

 palatal is deeply immersed, higher within, slightly sinuous. 

 The outer and basal margins of the peristome are uniformly, 

 slightly thickened within, not expanded ; the columellar mar- 

 gin is broadly expanded. 



Length 1.83, diam. 1 ; greatest length apert. 0.61. Cotype, 

 B. M. 



Length 1.75, diam. 1.03 ; greatest length apert 0.63. Cotype, 

 A. N. S. 



Oahu: Ewa, type loc., very abundant under stones on the 

 coral plain below "Sisal" (Cooke) ; Diamond Head (Cooke 

 & Pilsbry) : found only fossil. Cotypes 11065, Bishop Museum, 

 and 44694 A. N. S. P. 



The typical form of this species is easily distinguished from 

 N. waicmaensis by its larger size, more cylindrical form and 

 less convex whorls. Prom N. plicifera it is recognized by its 

 more tapering summit, but especially by the thickened parietal 

 callus, and the angular lamella terminating on the outer lip 

 rather than on the parietal callus, though it is very near the 

 junction of the two. 



4. NESOPUPA DISPERSA C. & P., n. sp. PL 27, figs. 7, 8. 



The shell is minute, perforate (umbilicus, extremely minute, 

 open, deep) sub-cylindrical, whitish or brownish in its fossil 

 state ; the last three whorls distinctly costulate ; opaque. 

 Spire sub-cylindrical, extended, with slightly convex tapering 

 outlines, rather obtuse at the summit, individual whorls moder- 

 ately convex, separated by a rather shallow suture. Whorls 

 5%, the embryonic large, the second slightly wider than the 

 third near its initial stage, nearly smooth, under a strong lens 

 very minutely punctate, the riblets beginning rather abruptly 

 near the end of the second whorl ; rest of the whorls increasing 

 slowly and regularly, distinctly finely and evenly costate, the 

 costae slightly oblique, about 0.07 apart on the penult and 0.09 

 on the last Avhorl, with the interstices minutely granulose ; last 

 whorl slightly broader than the penult, subcylindric, tapering 

 gradually toward the base, its last third straight, hardly as- 

 cending at the aperture, bisulcate behind the aperture, the 



