ACHATINELLA SPALDINGI AND LEHUIENSIS. 271 



by two specimens. Only of A. spaldingi was a fair series 

 obtained. All of the known colonies are on the northern 

 slope of the range. Who knows how many more wait hidden 

 in dark and difficult ravines, or perhaps a few steps aside 

 from some well-trodden trail! 



Probably all of the Waianae forms are descendants of a 

 single species, which migrated from the Koolau range, along 

 with Partulina dubia and the ancestor of Achatinella 

 mustelina. 



28. A. SPALDINGI Pilsbry & Cooke, n. sp. PL 42, figs. 1, 2, 3. 

 The shell is sinistral, imperforate, ovate-conic, ventricose 



and quite thin- white, with slightly interrupted or spotted 

 tawny bands and lines, of which band ii, above the periphery, 

 is the most constant. There is usually a group of bands near 

 the columella, and a space without bands at and below the 

 periphery; suture edged with a band or line of the white 

 ground; apex a trifle dusky. Surface not very glossy, or 

 often dull in old shells, somewhat roughened by growth- 

 wrinkles and irregularly scattered impressions. Whorls con- 

 vex, joined by an impressed suture. Aperture white and 

 showing the bands weakly within; outer lip not expanded,, 

 thin, acute. Columellar fold whitish, spiral, small. 



Length 16.5, diam. 11.1, aperture 9.2 mm., 5% whorls. 



Length 17.2, diam. 11.1 mm. 



Length 17.2, diam. 11 mm. 



Oahu, Waianae range: Pukuloa, one-half mile above the 

 Mountain House, back of Leilehua (Spalding). Cotypes in 

 A. N. S. P. and Bishop Mus. ; also in coll. Irwin Spalding. 



This species has the thin texture of A. papyracea, but it is 

 a much more capacious shell, differing in surface and color; 

 the spire is somewhat more attenuate near the apex. Quite 

 old specimens have a thickening within the lip, which is want- 

 ing in most adults. It is one of the few really distinct species 

 of Achatinellastrum. Named for a valued friend of both 

 authors. 



29. A. LEHUIENSIS E. A. Smith. PI. 41, fig. 11. 



"Shell sinistral, ovate-conic, somewhat glossy, very finely 



