4 NEWCOMBIA. 



sulcate), white; spire turrited, the apex rather acute; suture sub- 

 marginate. Whorls 7, the upper ones flat, obsoletely varie- 

 gated with brown; following whorls rather convex, the last 

 about two-fifths the total length, somewhat carinated in the 

 middle by a more acute cord. Columella lightly plicate. 

 Aperture a little oblique, obauriform; peristome nearly simple; 

 columellar margin subreflexed, a little expanded outwardly. 

 Length 17, diam. 6.5, aperture 7x3 mm. Sandwich Is., Frick 

 in Cuming coll. (Pfr.). 



Molokai: Pohakupili (Baldwin); Halawa (Borcherding, for 

 N. costata). 



Achatinella gemma PFR. , Malak. Blatter iv, 1857, p. 230; 

 Monogrp.phia iv, 560; P. Z. S., 1858, p. 22. Newcombia gemma 

 Pfr., SYKES, Fauna Hawaiiensis, p. 331. 



Achatinella (Newcombia) sulcata Pfr., BALDWIN, Catalogue, 

 1893, p. 8. Newcombia sulcata Pfr., GWATKIN; Proc. A. N. S., 

 Phila., 1895, p. 238 (dentition). Newcombia costata BORCHER- 

 DING, Nachrbl. d. d. Malak. Gesell, 1901, p. 57; Zoologica, p. 

 95, pi. 9, f. 2, 2a. 



The sculpture of the last whorl or two is more or less obsolete. 

 This form occurs associated with more strongly lirate shells, in 

 which the lirse are wider than in plicata, rounded, or more or 

 less marked with spiral striae. The gemma form is, in fact, only 

 an extreme phase, with obtuse lirse, of this race, which has been 

 called " sulcata Pfr. ' by Baldwin, and costata by Borcherding. 

 The description of the latter follows: 



Newcombia costata [pi. 1, figs. 4, 5, copied from Borcherding]. 



Shell subperforate, sinistral, turrited, rather solid; encircled 

 with close, elevated line, more slender in the upper whorls, 

 then more rounded, and sculptured with very fine longitudinal 

 lines; last whorl with 7 rounded, flattened ribs above the mid- 

 dle, the ribs suddenly w r eaker below the middle, and becoming 

 stronger again around the umbilicus. Color yellowish-white, 

 glossy. Spire regularly tapering; apex rather obtuse; suture 

 linear. Whorls 6, flatly convex, the upper flamed with yellow, 

 the last forming half the total length, rounded. Aperture in- 

 versely ear-shaped, white within. Columella slightly folded, 



