POLYNESIAN NESOPUP^. 331 



last whorl lower. Aperture smaller, semioval, 8-toothed, the 

 teeth stronger, white; 1 prominent, angular lamella, arc- 

 uately connected with the peristome; 2 parietals, the outer 

 one curved below, the interior very small; 2 columellar la- 

 mellae, compressed, high; 3 rather deeply placed palatals, 

 equidistant and subequal. Peristome discontinuous, whitish- 

 lipped, somewhat thickened at the receding sinulus, the middle 

 of the outer margin produced forward. 



Length 1.75, diam. 1 mm." (Bttg). 



Samoa Islands. 



[Pupa tantilla] var. godeffroyi BTTG., Conchologische Mitt- 

 heil., i, p. 53, pi. 10, f . 5. ? V. tantilla Gould, GABRETT, 

 Proc. A. N. S. Phila., 1887, p. 138 (Samoa Is.). 



Although showing much peculiarity, this form may be 

 viewed as a variety of P. tantilla Gld., as it approaches it 

 very nearly in the dentition, and by its shell characters it 

 may be recognized almost with certainty that a close blood 

 relationship unites it to that species (Bttg.). 



27. NESOPUPA TONGANA (Boettger). PI. 31, figs. 15, 16, 17. 



Shell more conic [than tantilla] the whorls more distinctly 

 and generally more distantly membranous-ribbed, the last 

 with protracted base and anteriorly more distinctly dilated 

 funnel-like, in the middle having a long longitudinal furrow. 

 Aperture a little larger, always oblique, rhomboidal, little 

 compressed basally, 6 to 8-toothed : one emerging sigmoid 

 angular ; the rest of the teeth deeply placed, 2 parietals, 1 or 

 2 columellars, 2 or 3 palatals, of which the upper is much the 

 largest, lamelliform, inside approaching close to the larger 

 parietal lamella, and entering deeply with it; the lower 1 or 

 2 palatals small and very deeply placed. Peristome brownish 

 lipped, somewhat thickened below the sinulus, the margins 

 joined by a thin callus. 



Length 2i/ 8 to 2%, width 1% mm." (Bttg.). 



Tonga group : Tonga Tabu. 



Pupa tongana O. Semper in Museum Godeffroy Catal., v, 

 1874, p. 89 (name and locality Tongatabu only). [Pupa tan- 

 tilla} var. tongana 0. Semper, BOETTGER, Conchol. Mittheil., 

 i, 1881, p. 54, pi. 10, f. 6 and 11, f. 7. 



