298 HAWAIIAN NESOPUPAE. 



12. NESOPUPA INFREQUENS C. & P., n. sp. PL 28, fig. 7. 



The shell is simstral, minute, sub-perforate (perforation 

 very minute), nearly cylindrical, buckthorn brown, thin, trans- 

 lucent, hardly glossy ; under a strong lens the surface is very 

 minutely, closely and obliquely wrinkled, the wrinkles hair- 

 like, rather short, more or less anastomosed. Spire with con- 

 vex outlines, gradually tapering towards the apex, individual 

 whorls slightly convex, separated by a rather narrow suture. 

 Whorls 5, the embryonic nearly smooth, under a strong lens 

 minutely granulose, the granules apparently arranged in trans- 

 verse rows, the minute striae gradually appearing at about the 

 middle of the second whorl. The last whorl tapers gradually 

 to the base, ascending slightly near the aperture, slightly flat- 

 tened over the palatal plicae, and only faintly swollen back of 

 the aperture. Aperture scarcely oblique, nearly perpendicu- 

 lar, irregularly truncate-ovate, lip-insertions remote, united 

 by a thin transparent callus. Angular lamella short, lamella- 

 like, deeply seated; parietal strong, high, emerging further 

 than the angular, perpendicular to the parietal wall; colu- 

 mellar lamella rather short, strong, deeply seated, indistinctly 

 slanting downwards; two palatal plicae not approaching the 

 peristome, rather short, nearly parallel. Peristome very 

 slightly thickened within, arched above the columella, slightly 

 expanded on the lower margin, the outer margin erect. Length 

 1.65, diam. 0.98, apert. (diag.) 0.65 mm. 



Kauai: Halemanu, on a tree trunk; also on ferns (Cooke), 

 Holotype 15489 Bishop Museum. 



It is the only sinistral Hawaiian Nesopupa known. Besides 

 its sinistral coil, it is easily recognized from the other species 

 of Nesopupa by the slightly coarse anastomosing striae of the 

 lower whorls. 



One of us (Cooke) recently collected probably about 40 

 specimens in different localities, the extreme points probably 

 six miles apart. It has a different habit from any of the 

 true Nesopupae ; all the specimens taken in 1919 were on the 

 fronds of ferns (Asplenium arnottii). A single one, the type, 

 had previously been found on a tree. 



