290 HAWAIIAN NESOPUPAE. 



C'. Surface, between stria?, minutely granulose. 

 Hawaii. N. forbesi, no. 11. 



b 2 . Adult shells less than 1.9 mm, in length. 



c 1 . Aperture of adult shells always furnished with 

 a minute basal fold. N. d. kaalaensis, no. la. 

 c 2 . Basal fold usually absent, only present in very 

 rare individual instances. 



d 1 . Adult shells minute, less than 1.4 mm. in 

 length. Molokai. N. dubitabilis, no. 7. 

 d 2 . Adult shells more than 1.5 mm. in length. 

 Maui, Hawaii. 



e 1 . Palatal plica? very short. Hawaii. 

 f 1 . Shells broadly ovate to glo- 

 bosely ovate, parietal and 

 angular lamella? \vell separ- 

 ated. N. anceyana, no. 8. 

 f 2 . Shells nearly cylindric, angu- 

 lar lamella usually dentiform, 

 placed close to the parietal. 



N. subcentralis, no. 9. 

 e 2 . Palatal plica? longer. Maui. 



N. limatula, no. 6. 



6. NESOPUPA LIMATULA C. & P., u. sp. PI. 28, figs. 6, 10. 



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

 almost closed), ovate, the last two whorls hazel, apical whorls 

 much paler ; rather thin ; translucent with a silky sheen, micro- 

 sopically striate. Spire with convex outlines and a rather ob- 

 tuse apex; individual whorls convex, separated by a rather 

 deep suture. Whorls 5 to 5*4, the embryonic 1% whorls con- 

 vex, almost smooth, under the microscope very minutely punc- 

 tate, viewed with oblique light the points arranged in spiral 

 lines, glossy ; the remaining whorls faintly striate, striae 

 slightly flexuous, very low, evenly spaced, the interstices and 

 striae covered with a fine network of minute wrinkles only seen 

 under the microscope. The last whorl is rotund at the back, 

 ascending slightly near the aperture, a little contracted behind 



