152 ACHATINELLA ROSEA. 



be observed tha.t the marginal [subsutural] groove, which is 

 scarcely perceptible in the last, is in this very distinct ' 

 (Sivainson). 



Length 22.3, diam. 13.5 mm. ; G 1 /^ whorls. 



Length 23, diam. 13 mm. 



Length 19, diam. 12 mm. 



Oahu : Helemano and Poainoho to Kaukinehua ; formerly, 

 according to Gulick, from Kawailoa to Ahonui. 



[A. bulinwides] var. ? (rosea-) SWAINSON, The Quarterly 

 Journal of Sci., Lit. and Art, January to Jiine, 1828, p. 85. 

 Achatinella rosea SWAINS., Zoological Illustrations, III, 2d 

 series, p. 123, pi. 123, f. 2. REEVE, Conch. Icon., vi, pi. 4, f. 

 28. PFR., Monogr., ii, 236; iii, 456; iv, 518; vi, 163. 

 THWING, Orig. Descript., p. 93. 



A. rosea is invariably sinistral. It further differs from A. 

 biilimoides by being smoother, more glossy. The colour varies 

 widely, but the older collectors found only the white and pale- 

 rose forms, which, from the large series in old collections, 

 must have been abundant in the time of Newcomb and Gul- 

 ick. Figures la to 2a represent the usual color-forms of the 

 species, the other forms figured being more or less rare. It 

 evidently extended lower than the dark-colored forms, in a 

 zone now barren by the recession of the forests. Gulick's 

 localities none of them more exactly located than by the val- 

 ley or district were Wahiawa, Waialua, Helemano (pi. 34, 

 figs. 1, la-), Opaeula and Kawailoa, all of the many speci- 

 mens being white or pale-rose or light rosy-brown, with roseate 

 lip, the colonies apparently homogeneous except for these fluc- 

 tuations of tint. 



According to Mr. Spalding the headquarters of white or 

 nearly white rosea are in Helemano, but it is found from Ka- 

 wailoa to Kaukinehua in the Wahiawa district. There are 

 many gradations of tint between the white shells, the faint 

 rose, and the rose with white bands. An albino form with 

 the lip pure white has been taken by Mr. Spalding in a small 

 ravine in the eastern edge of Helemano, just above the forest 

 limit, similar to pi. 34, fig. 1, Helemano, Gulick coll. 



A. rosea varies a good deal in size and shape. Typically 

 colored shells from Wahiawa, Gulick, measure: 



