36 PARTULINA, MOLOKAI. 



Molokai (Newcomb): Makakupaia, Kawela, (fig. 2), Mako- 

 lelau, Kamalo and Punkaeha, fig. 1, (Meyer); Kamalo 

 (Baldwin). 



Achatinella dwightii NEWCOMB, Ann. Lye. N. H. of N. Y. vi, 

 p. 145, October, 1855; P. Z. S. 1855, p. 207; American Journal 

 of Conchology ii, p. 213, pi. 19. f. 9. PFR., Monogr., iv, p. 

 517. SYKES, Fauna Haw. p. 313. THWING, Reprint Orig. 

 Descr. Achat. pi. 2. f. 7. Partulina d. , BORCHERDIKG, Zoologica 

 xix, p. 68, pi. 5, f. 1-8. 



P. dwightii is characterized by the solidity, narrow form with 

 a high, straight-sided, acute spire, and the streaked, mildewed 

 appearance. Typically the last embryonic whorl has protractive 

 stripes and the following whorls of the spire show fleshy-brown 

 mottling or confused zigzag patterns on a pinkish or yellowish- 

 white ground. Last whorl streaked, usually paler below the 

 suture. The surface has rather rude, irregular but low growth- 

 lines, and on the last whorl there are regular, distinct, waved 

 spiral strias in shells from Newcomb (fig. 5). In most other 

 lots seen the spirals are quite weak or faint. The aperture is 

 small, and the rib is placed rather far within, so that there is an 

 unusually wide whitish lip. The outer edge often expands 

 noticeably. In fully adult shells the columellar lamella is 

 strong and white or nearly so. Some specimens are white with 

 only faint brown streaks and stains, the aperture delicately 

 lilac-tinted, lip white. In others the brown streaks are dark, 

 in part blackish, and nearly cover the last whorl. 



Length 26, diam. 15, aperture 13 mm. 



Length 25, diam. 13.5, aperture 12 mm. 



Length 22, diam. 13, aperture 10.8 mm. 



The shape is more straightly pyramidal than in A. redfieldi, 

 which also differs by its brown columellar fold and the narrower 

 and brown Up. Its range of patterns is also different. 



14a. P. dwightii compta (Pease). PL 8, figs. 6, 7, 8. 



Shell sinistral, narrowly perforate, rather solid, oblong-conic; 

 spire obsoletely transversely delicately rugose-striate, the 

 wrinkles disappearing on the last whorl, and longitudinally im- 

 pressed with delicate, irregular stria?. Spire turrited or oblong- 



