4 PBONESOPUPA. 



d 2 . Aperture furnished on the parietal wall 

 with a minute angular or parietal la- 

 mella, more often with both. 



P. boettgeri, no. 5. 



a 2 . Adult shells with 5-5% whorls; costse without membran- 

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

 Sericipupa) . 



b l . Whorls closely coiled, convex. 



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



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



c 2 . Adult shells with diameter more than 55 % of 



length. P. lymaniana, no. 12. 



b 2 . Whorls more loosely coiled, very convex. 



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



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



Hawaii. P. sericata, no. 11. 



d 2 . Adult shells about 2.3 mm. in length. 



E. Maui. P. /. corticicola, no. 80. 



c 2 . Adult shells less than 2.1 mm. in length. 



d 1 . Adult shells less than 2.0 mm. in length. 

 e 1 . Adult shells between 1.9 and 2.0 

 mm. in length. Molokai. 



P. molokaiensis, no. 9. 

 e 2 . Adult shells between 1.7 and 1.8 

 mm. in length. Kauai. 



P. incerta, no. 10. 



d 2 . Adult shells between 2.0 and 2.1 mm. in 

 length. E. Maui. P. frondicola-, no. 8. 



Section Pronesopupa. 



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

 ovately conic-helicoid, with 4-41/2 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 costae 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 



