HAWAIIAN NESOPUPAE. 307 



sculpture and the short, lamella-like, or nodular angular 

 lamella, which is sometimes lacking. 



The species are rather closely connected ; however, they seem 

 to be sufficiently differentiated from each other, and may be 

 easily recognized. N. newcombi is by far the most variable 

 species of the family found in the Hawaiian Islands, and a 

 number of quite distinct races have here been grouped under 

 this name without subspecific rank. 



Key to the Species of the Section Limbatipupa. 



a 1 . Angular lamella absent or represented by a slightly swol- 

 len callus. 



6 1 . Whorls 4, embryonic whorls minutely spirally striate, 

 diameter about 70% of total length. 



N. alloia, no. 19. 



b 2 . Whorls 4%-5, embryonic whorls granulose, diameter 

 about 60% of total length. N. singularis, no. 18, 



a 2 . Angular lamella nodular or short lamelliform. 

 b 1 . Costa? prominent, thin, membranous. 



c 1 . Upper palatal fold short lamella-like. 



N. newcombi, no. 15.- 

 c 2 . Upper palatal fold absent or nodular. 



N. oahuensis, no. 16,. 

 b 2 . Costae low, with very narrow membranous margin. 



N. kauaiensis, no. 17. 



15. NESOPUPA NEWCOMBI (Pfr.). Page 309, fig. 1. 



The shell is minute, perforate (perforation very minute,, 

 circular), ovate, brownish olive, thin, somewhat translucent, 

 slightly shiny, uniformly and widely costulate, the riblets with 

 membranous margins, about 15 on the last whorl. In some 

 specimens they are slightly spiniferous just above periphery. 

 Intercostal spaces minutely striate (striae short, parallel). 

 Spire conic with convex outlines, apex obtuse; individual 

 whorls convex, separated by a rather deep suture. Whorls 

 4%, the embryonic 1% whorls are microscopically granulose, 

 the granules apparently arranged in transverse rows, the mem- 

 branous costa? appearing abruptly in about the middle of the.- 



