HAWAIIAN NESOPUPAE. 283 



lamella is proportionally slightly weaker than that of 

 N. pUcifera and is attached to the outer lip rather than the 

 parietal wall ; the lower palatal fold is accompanied by a denti- 

 form nodule whicli does not appear to be developed in any 

 specimens of plicifera ; the lip insertions converge more and 

 are nearly united by a thicker callus. Externally it has two 

 strong furrows on the last whorl. 



3. NESOPUPA LITORALIS C. & P., n. sp. PI. 28, fig. 1. 



The shell is minute, perforate and shortly rimate, cylindrical, 

 the upper third convexly conic, whitish in its fossil state, the 

 last four whorls obliquely costate. Spire nearly cylindrical 

 with slightly convex outlines, tapering above to a rather blunt 

 apex, individual whorls only weakly convex, separated by an 

 impressed suture. Whorls 5y 2 to 5%, the first and second of 

 nearly equal width, the rest increasing very slowly and regu- 

 larly; the embryonic shell, under a strong lens, almost smooth 

 for about l^j whorls, the costas at first rather weak, blunt, the 

 rest of the whorls evenly costate, costa? oblique, with blunt 

 edges, about 0.07 mm. apart on the penult and 0.11 apart on 

 the last whorl, the interstices nearly smooth. Last whorl 

 nearly cylindrical, tapering gradually towards the base, as- 

 cending very slightly to the aperture, bisulcate on the back, 

 the sulci corresponding to the palatal plicae, the lower sulcus 

 shallow, broad, strongly arched, terminating at a slight dis- 

 tance from the peristome, the upper, shallower, wide, nearly 

 parallel almost reaching the peristome, the two separated by 

 a rounded ridge. Aperture truncate-ovate, rather small, con- 

 tracted within, its outer margin very slightly sinuous, slightly 

 oblique, perpendicular, the lip-insertions united by a thick 

 callus. Angular lamella strong, long, slightly diverging from 

 the parietal, and nearly equal to the latter in height, extend- 

 ing nearly to the margin of the peristome and united with it 

 just outside of the lip insertion. Parietal lamella strong, quite 

 oblique, deeply penetrating. Columellar lamella rather strong, 

 at first transverse to the axis, then abruptly turning down- 

 ward at right-angles. The upper palatal fold is long, strong, 

 extending to the inner margin of the peristome, with a de- 



