ACHATINELLA SWIFTH. 315 



"Apex polymorpha Gk. (pi. 59, fig. 4 to 4e. Waipioy 

 Gulick coll.). Shell dextral, subperf orate, globose-conic, 

 glossy, striated with growth (scarcely with spiral) lines; di- 

 lute brown, ornamented with several zones and blue-black 

 streaks, and encircled with a snow-white zone at the periphery. 

 Suture lightly margined, brown. Whorls 6, the first four a 

 little convex, whitish, the rest convex. Spire slightly con- 

 cave. Aperture white; peristome thickened within, brown- 

 tinted; columellar fold strong, whitish. Length 17, diam. 

 12 mm. 



"Var. a. Shell fawn, the suture brown. 



"Var. b. Shell white, a few zones and the base brown, 

 suture brown. 



1 'Station, on the leaves of the ohia and other trees. 

 Habitat, The typical forms are found in Waipio and Wahiawa 

 on Oahu. Varieties are sometimes found in Kalaikoa and 

 Ahonui. 



"Affinities. It is most nearly allied to A. versicolor Gk., 

 and A. tuberans Gk. Remarks : In Waipio and Wahiawa 

 two-thirds of the specimens are dextral; in Ahonui and 

 Kalaikoa only about one-eighth are dextral. The specimen 

 figured is from Waipio" 



In the pattern selected by Mr. Gulick as typical, the shell 

 is dextral, brownish drab, varying in shade, and streaked with 

 paler or whitish ; there is a white peripheral girdle and some 

 darker spiral lines, the sutural border being tawny or brown. 

 Embryonic whorls ivory, or white shading into yellow towards 

 the suture below, the tip faintly dusky, gray, or sometimes 

 white. This particular pattern is not the commonest, and ap- 

 proaches the coniformis pattern. In other shells of Gulick 's 

 Waipio lot the color is orange-cinnamon ; pinkish buff towards 

 the suture, cinereous below. Pale yellow below, white stained 

 with pale purplish gray above. White with chestnut bands 

 and lines ; also other patterns, running into flavida, tuberans, 

 etc. See pi. 59, figs. 4-4e, Waipio, coll. by Gulick. PI. 58, 

 figs. 10, 10a, Kalaikoa, Gulick. Some of the "polymorpha" 

 from Kalaikoa are not distinguishable from cestus, though I 

 do not believe them to be directly related to that. I believe it 

 to be a case of the same pattern appearing independently in 

 two derivatives of the same ancestral stock. 



A. innotabilis Smith is one of the "polymorpha" patterns. 



