PRONESOPUPA. 



d~. Aperture furnished on the parietal wall 

 with a minute angular or parietal la- 

 mella, more often with both. 



P. ~boettgeri, 110. 5. 



a~. Adult shells with 5-5% whorls; costge without membran- 

 ous edges; last whorl with more than 45 costee (Section 

 Sericipupa). 



b\ Whorls closely coiled, convex. 



c 1 . Adult sliell with diameter less than 55% of 



length. Hawaii. P. orycta, no. 13. 



c-. Adult shells with diameter more than 55% of 



length. P. lymaniana, no. 12. 



&-. Whorls more loosely coiled, very convex. 



c 1 . Adult shells more than 2.2 mm. in length. 



rf 1 . Adult shells about 2.7 mm. in length. 



Hawaii. P. scricata, no. 11. 



(/-'. Adult shells about 2.3 mm. in length. 



E. Maui. P. f. corticicola, no. 8a. 



c". Adult shells less than 2.1 mm. in length. 



f/ 1 . Adult shells less than 2.0 mm. in length. 

 e\ Adult shells between 1.9 and 2.0 

 mm. in length. Molokai. 



P. molokaiensis, no. 9. 

 r-'. Adult shells between 1.7 and 1.8 

 mm. in length. Kauai. 



P. incerta, 110. 10. 



</-. Adult shells between 2.0 and 2.1 mm. in 

 length. E. Maui. P. frandicola, no. 8. 



Section Pronesopupa. 



in Hawaiian species the shell is minute, dextral, perforate, 

 ovately conic-helicoid, with 4-4i^> whorls. Embryonic whorls 

 granulose, the granules arranged in transverse rows, towards 

 the last of the second whorl the granules uniting into distinct 

 costse. Margin of the costas sharp, thin, transparent, mem- 

 branous, often extended into membranous spines, the inter- 

 stices covered with minute wrinkles. Aperture truncate 

 above, the lip insertions remote. The outer lip thin, slightly 



