NEWCOMBIA. 



whitish, spire elongate, the apex rather obtuse. Whorls 6, a 

 little convex, those of the summit marbled with brown. Colu- 

 mellar fold obsolete. Aperture semioval ; peristome unex- 

 panded, acute. Length 15, diam. 6 mm.; aperture 6x3 mm. 



Molokai (Mighels in Cuming coll.): Kalae (Meyer); Moanui 

 (Thaanum). 



Achatinella plicata Mighels MS., PFR., Monographia Hel. 

 Viv., ii, p. 235 (1848). REEVE, Conch. Icon., pi. 6, f. 44a, b. 

 (1850). NEWCOMB, Ann. Lye. Nat. Hist, of N. Y., vi, 1858, 

 p. 312. THWING, Reprint Orig. Descript. Achat., 1907, pi. 3, 

 f. 11. Newcombia plicata Migh., BORCHERDING Zoologica, p. 94, 

 pi. 9, f. 1, la.Bulimus liratus PFR., P. Z. S., 1851, p. 261, 

 under B. newcombianus Pfr. (1853), no description; new naiuo 

 for plicata ' Migh.' Pfr. 



The shell is perforate. The apex is obtuse, rounded, smooth 

 in the first half-whorl; then spirals begin above the suture at 

 the end of 1 J whorls; then about 6 to 8 smooth, subequal spiral 

 cords. On subsequent whorls the cords become more acute, 

 and some interstitial threads appear. The growth-stride become 

 strongly developed and irregular. The third whorl is longi- 

 tudinally striped with brown or pale olive, the rest of the 

 whorls being uniform cream color. The peristome in fully 

 adult shells is narrowly expanded and thickened within. Colu- 

 niella weakly sinuous, its edge dilated in a triangular white 

 callus above. 



Length 18, diam, 8.2 mm.; whorls 6. 



Length 25, diam. 9 mm.; whorls 6J. 



Newcomb described the animal as "rather shorter than the 

 shell; tentacles at their origin closely approximating, short and 

 strongly clubbed; bottom of foot, mantle, and posterior part 

 light grey, entirely mottled with fine bluish dots. Motions at 

 first sluggish and timid but soon becoming bold, rapid and 

 gliding.' 



la. N. PLICATA GEMMA (Pfeiffer). PI. 1, figs. 7, 8, 10, 11. 



Shell subimperforate, sinistral, oblong-turrite, rather solid, 

 striatulate and spirally lirate (the lirse rather flattened, closely 



