ACHATINELLA SWIFTII. 311 



dilated, bordered within, tinted with dilute rose-brown ; colu- 

 mellar fold strong, pale rose color. Length 19, diam. 13 mm. 



' Var. : shell gray- white, scarcely streaked ; the last whorl 

 zoned with blackish-brown at the periphery and base. 



' Station, on trees ; habitat, Ahonui and Kalaikoa, on Oahu. 

 Affinities: it seems to be an intermediate form between A. 

 decorus Fer. and A. tuber ans Gk. This species it always sinis- 

 tral. The specimen figured is from Ahonui' (Gulick). 



In the type specimen, no. 101 of Gulick 's series, Boston Soc. 

 coll., the first embryonic whorl is gray white, becoming 

 light ochraceous buff on the second whorl, after which white 

 bands appear. The last 2% whorls have light purplish gray 

 streaks on a white ground. Immediately above the periphery 

 the streaks coalesce into an irregular white-streaked band of 

 blackish Vandyke brown ; and a similarly colored area occu- 

 pies much of the base. The supraperipheral band ascends the 

 spire, forming a narrow dark border above the suture. The 

 lip and columellar fold have a pale flesh tint. Length 18, 

 diam. 13 mm. 



There is a large series of versicolor from Ahonui in coll. A. 

 N. S., collected by Gulick. An inspection of these shows at 

 once that the type was merely a .specimen selected out of a 

 chain of patterns which completely unite versicolor, tuberans, 

 coniformis and even flavida, all of which Gulick recognized 

 from Ahonui. The versicolor pattern also runs inextricably 

 into the polymorpha pattern. Several additional versicolor of 

 Gulick 's Ahonui set are figured, pi. 58, figs. 14a to 15. Many 

 specimens are smaller than the type, down to 16 mm. long. 



"Apex flavidus Gk. (pi. 58, figs. 12, 12a, cotypes no. 95 Gu- 

 lick type coll., Boston Soc.). Shell dextral (sometimes sinis- 

 tral), shortly ovate-conic, little shining, striated with incre- 

 mental (but hardly spiral) lines; more or less yellow, en- 

 circled in the middle of the whorl with a wide chestnut zone 

 (sometimes two or three zones on the base) ; suture narrowly 

 margined with brown (sometimes white). Whorls 6, a little 

 convex, the first three always white ; spire almost straightly 

 conic, scarcely concave. Aperture whitish, receding; peristome 

 pale rose, slightly dilated ; thickened within ; columellar fold 

 large, roseate. Length 20, diam 12% mm. 



"Var. a. Shell dextral or sinistral, subglobose-conic, yel- 



