POLYNESIAN NESOPUPAE. 325 



somewhat four-sided, rounded at the corners, the lip slightly 

 expanding and the throat armed with five teeth, one on the 

 columella, one at the base, one on the outer lip, and two un- 

 equal approximate ones on the middle of the transverse lip. 

 There is a small umbilical fissure. Length 1/15, width 1/20 

 inch (Gould). 



Society Islands: Tahiti at 2000 ft. (Couthouy, U. S. Ex- 

 ploring Exped.) Tahiti, Huaheine, Borabora and Maupiti 

 (Garrett). Also reported from the Marquesas, Paumotu 

 Archipelago, and as far west as Viti, but these forms require 

 critical comparison. 



Pupa (Vertigo) tantilla GOULD, Proc. Bost. Soc. N. H. ii, 

 1847, p. 197; Expedition Shells p. 33. Vertigo tantilla 

 GOULD, U. S. Expl. Exped., xii, Mollusca and Shells, 1852, p. 

 92, pi. 7, f. 105, #, &.- GARRETT, Journ. Acad. Nat. Sci. Phila. 

 viii, 1881, p. 400 (Cook's or Harvey Islands) ; ix, p. 84; Bull. 

 Soc. Malac. France, iv, 1887, p. 34 (Marquesas). Pupa tan- 

 tilla Gld., PPR., Mon. Hel. Viv. iii, 557. BOETTGER, Conchol. 

 Mittheil. i, 1881, p. 49, pi. 10, f. 1. "P. pazi Crosse" Ancey, 

 Bull. Soc. Malac. France, iv, 1887, p. 35, footnote. 



This senior member of the group differs from its allies by 

 the smaller number of teeth, 5, or when an interpalatal is 

 developed, 6. The inner end of the columellar lamella turns 

 down less than in related forms. 



The type specimen, 5505 U. S. N. M., labelled as the original 

 of Gould's figure 103, is drawn in pi. 30, figs. 1, 2, 3. The sur- 

 face is minutely confluent-pitted or pox-marked with traces of 

 striae as usual in the Polynesian group. The last whorl has a 

 rather short and shallow furrow over the upper palatal fold. 

 Angular lamella high, straight within, then well curved out 

 to join the lip. Parietal lamella curved. The columellar 

 lamella is horizontal, its inner end curving downward, but far 

 less than in N. pleurophora or armata. The upper and lower 

 palatal folds are rather short, subequal, and between them a 

 small interpalatal stands. It is hard to see, and evidently was 

 overlooked by Gould; (but in other specimens it is wanting). 

 There is no basal fold or subcolumellar lamella, but in oblique 

 view a very weak, hardly noticeable trace of a subcolumellar 



