178 ACHATINELLA SOWERBYANA. 



with dull purple. Lip-rib narrow and whitish or very pale. 

 Columellar fold moderate, pink. 



Length 17.2, diam. 10.5, aperture 8.5 mm. ; whorls 5~y 2 . 



Length 16, diam. 9.5, aperture 8 mm. ; whorls 5%. 



Length 16, diam. 8.7 mm. 



Kahuku, 1,500-1,700 ft. elevation, L. A. Thurston, cotypes 

 in coll. A. N. S. and Bishop Mus. Also in Thurston collection. 

 Waimea, overlooking Laie, Irwin Spalding. 



Rarely the pigment is deficient, ground white throughout 

 and the band reduced to a group of pale-brown lines (fig. 

 136). This decolored form approaches A. s. laiensis. There 

 may also rarely be traces of faint spiral lines near the lip on 

 the upper surface. These lines are yellowish with several pink 

 ones near the peripheral white band. These colors are so 

 delicate that they can hardly be seen without a lens, and are 

 mentioned here chiefly because this pattern reminds one of 

 A. casta. The fact is, A. s. thurstoni stands on the border- 

 line between Bulimella and the casta group. Looking at 

 some individuals one is disposed 'to rank it as a variety of 

 sowerbyana, while others have features which certainly come 

 as near to casta. Figs. 13 to 136 are cotypes from Kahuku. 



Further southeast on the main range, upon -the Waimea- 

 Laie ridge, Mr. Spalding found a lovely color-form, illus- 

 trated in pi. 34, figs. 14, 14&, 146. As in the typical color- 

 pattern, the ground-'color is wax-yellow below the periphery, 

 white above it (when not covered by another 'Color) ; either 

 bandless or with four peach-red, coral-red or geranium-pink 

 bands: sutural, supra- and infra-peripheral and columellar; 

 or bands i and ii may be concreiscent into a broad zone, as in 

 fig. 14 ; lip-rib narrow, whitish or with spots at the ends of the 

 bands ; apex dusky purplish or nearly white. Length 15 to 

 16 mm. 



136. A. SOWERBYANA LAIENSIS Pilsbry & Oooke, n. subsp. PI. 

 34, figs. 15, 15a. 



The shell is sinistral, ovate-conic, moderately solid ; white, 

 with several brown bands, from burnt-sienna to chestnut in 

 color; the one below the periphery is widest and most con- 



