NESOPUPA. 



275 



units are to be combined in one classification. Different com- 

 binations of characters, and parallel but not identical stages 

 in their evolution are to be considered. Under these condi- 

 tions it has been thought most convenient for those concerned 

 to treat the species by faunal rather than by taxononic groups. 

 The following synopsis of classification is therefore an arrange- 

 ment for convenience, in which groups of different faunas in 

 a similar stage of evolution but not directly related are some- 

 times juxtaposed. 



Synopsis of Sections of Nesopupa. 



a 1 . Angular lamella long, entering rather deeply, anteriorly 

 curved, joining the peristome. 



Inner end of the columellar lamella turning downward I. 



Inner end of columellar lamella straight or upturned II. 



a 2 . Angular lamella not entering deeply, straight, joining the 



peristome III.. 



a 3 . Angular lamella very short, nodular or shortly lamellar, 



sometimes not emerging to the peristome IV.. 



I. 



Nesopiipa, typical section. The angular lamella is long, 

 strong, curving to join the outer lip near its insertion; the 

 inner end of the columellar lamella turns downward ; there are 

 at least 5 well developed teeth. The surface is more or less 

 pitted-granulose, with spaced cuticular riblets, often deciduous. 



This Section includes all of the Nesopupse of Polynesia and 

 Micronesia which we have seen, N. moluccana, N. gonioplax 

 of Mauritius, and probably the Melanesian species. 



N. tantiUa (Gld.). Tahiti. 

 N. pleurophora (Shutt.). Tahiti. 

 N. armata (Pse.). Borabora. 

 N. paivae (Crosse). Gambier Is. 

 N. dentifera (Pse.). Cook Is. 

 N. godeffroyi (Bttg.). Samoa Is. 

 N. tongana (Bttg.). Tonga Is. 

 N. vitiana (Bttg.). Viti Is. 



N. norfolkensis (Sykes). Norfolk I. 

 N. lifouana (Gass.). Lifu. 

 N. mariei (Crosse). New Caledonia. 

 N. quadrasi (Mlldff.). Guam. 

 N. eapensis (Bttg.). Yap, Carolines. 

 N. ponapica (Mlldff.) . Ponape, ' ' 

 N. moluccana ( Bttg. ) . Amboina. . 

 N. gonioplax ( Pils. ) . Mauritius. 



