260 ACHATINELLA DIMORPHA. 



The dimorpha forms were collected in abundance by Gulick 

 and J. S. Emerson in the Fifties. In the last few years they 

 have been taken by Messrs. Spalding, Kuhns and Wilder. 



Waimea. Mr. Gulick obtained shells of zonata, albescens 

 and dimorpha patterns. Some of the albescens have two- 

 thirds of the last whorl yellow, with a white line at the per- 

 iphery, elsewhere white. Others are typical, the yellow fad- 

 ing upwards to white which forms a zone below the suture. 



Pupukea. The type specimen of dimorpha, no. 56 Boston 

 Soc. coll., from Pupukea, is figured, pi. 47, fig. 1. The last 

 whorl is amber yellow, fading upwards to nearly white near 

 the narrow chestnut sutural band. This band ascends to the 

 summit, but on the embryonic whorls it widens and becomes 

 ochraceous. Surface glossy ; aperture and columellar fold 

 white, the latter small. The Gulick collection also contains a 

 good series from Pupukea, comprising (a) the three-banded 

 typical zonata pattern, both sinistral and dextral; (6) shells 

 with white ground or faintly yellow, fading upwards, with a 

 tawny sutural band, the embryonic whorls white or with an 

 ochraceous band, columellar fold white; rarely dextral (fig. 

 2), and in one shell the bands of zonata are faintly indicated, 

 (c) albescens pattern, the last whorl straw yellow, deeper near 

 the lip, fading upwards, no bands. Probably all of these 

 forms were from one colony. 



Mr. Spalding 's No. 2187, from the Pupukea side of the 

 Paumalu ridge contains exactly typical dimorpha, together 

 with shorter shells indistinguishable from curta, the last two 

 whorls yellow, band chesntut ; also a form resembling pattern 

 b of Gulick 's lot, having the shell white, sutural band dark 

 vinaceous, not extending upon the white embryo, the colu- 

 mellar fold lavender. These three patterns are shown in pi. 

 47, figs. 3, 4, 5. 



In the third gulch towards Kahuku from Pupukea Mr. 

 Kuhns collected beautiful 3-banded zonata with albescens 

 and a pure white form (pi. 47, figs. 6, 7, 8). 



Paumalu-Kaunala ridge. A series taken by Mr. Spalding 

 comprises very beautiful zonata and albescens forms, the latter 

 white to yellow, often with a white peripheral line. Some of 



