ACHATINELLA SOWERBYANA. 179 



stant, one above the periphery is usually present, with some- 

 times a sutural line and columellar patch also; rarely the 

 shell is pure white. The apex is whitish or tinged with dull 

 purple. Surface has a moderate gloss, and) is weakly striate 

 under the lens. Suture distinctly margined. The aperture 

 is not very oblique, white within ; lip a trifle expanded at the 

 edge, having a rather narrow whitish callus rim within, dull 

 purplish-brown towards the edge in well j banded individuals. 

 Columellar fold white, or often in part brownish. 



Length 17, diam. 9.7, aperture 8.3 mm. ; 5% whorls. 



Length 16, diam. 9.5, aperture 7.4 mm. 



Oahu : Laie, 'division ridge above the Castle cut trail, Irwin 

 Spalding. Cotypes in A. N. S. and Bishop Mus. Also in 

 Spalding coll. 



This subspecies does not have the greenish-yellow cuticle or 

 brilliant gloss of A. sowerbyana. The bands are vertically 

 streaked with chestnut on a lighter, more yellow tint, the con- 

 trast more obvious in some specimens than in others. Whether 

 it will eventually prove separable from A. s. thurstoni cannot 

 now be decided. Its locality is rather remote from the area 

 of A. casta, some of the Waimano patterns of which certainly 

 resemble laiensis. 



There are a few white, 'bandless specimens in Mr. Spald- 

 ing 's lot from the type locality, no. 3556 of his collection, and 

 one shell with yellow base and wide subperipheral blackish 

 band ('band iii), establishing a connection with var. thurstoni. 



13c. A. SOWERBYANA DEXTROVERSA P. & C., n. Subsp. PL 35, 



figs. 8 to 13. 



Shell dextral, white, sometimes uniform, 'but typically en- 

 circled by several bands, which are light-brown, vertically 

 streaked with chestnut; a narrow chestnut columellar area; 

 suture margined with a dark line which ascends to the apex, 

 in banded individuals. Penstome narrowly thickened within, 

 pale with dark spots at the ends of the bands. Columellar 

 fold moderate, white or nearly so. Length 18.5, diam. 9.5, 

 aperture 9 mm. ; 5% whorls. 



Pupukea, D. Thaanum. Cotypes in A. N. S. P. and Bishop 

 Museum. Also in Thaanum coll. 



