ACHATINELLA DECIPIENS. 147 



Achatinella corrugata Gulick from Hakipuu (pi. 32, figs. 

 7, la, 76) seems to me to be almost identical with decipiens, 

 from "which it differs chiefly 'by the usually more corrugated 

 surface, which shows only very indistinct traces of minute 

 spiral sculpture. The color-patterns resemble the streaked 

 forms of torrida except that none in the large lot has a white 

 subsutural band, such as torrida and decipiens often possess. 

 Gulick 's type is streaked with olive-green on a pale-green 

 ground (pi. 32, fig. la). Others are streaked with chestnut 

 on a yellow ground, with or without one or two spiral chest- 

 nut or blackish bands, while still other shells 'are brownish- 

 black with a white summit. None has spiral white bands, and 

 very few have two chestnut bands. Gulick remarks that sims- 

 tral examples have been found. I have noticed one in the lot 

 of several hundred shells from his collection. The original 

 description of corrugata follows. 



" Shell dextral, imperf orate, ovate, solid, shining, striated, 

 green; apex subacute, pale; spire convexly conic; suture mar- 

 gined, moderately impressed; whorls 5!/2> convex, the lasc 

 rugose; >eolumellar fold central, white, strong; aperture truii- 

 cately auriform, white within; peristome thickened within, 

 white, sometimes margined with brown, with external margin 

 dilated, adnate; parietal margin wanting. Length 18%, diam. 

 10 mm. ; average weight 5.3 grains. Hakipuu, Oahu, on trees. 

 The color is often nearly black, and sometimes reddish-yel- 

 low " (Gulick). 



A rather large shell measures, length 19.1, diam. 10.8 mm. : 

 a very narrow blackish one, length 18, diam. 8.5 mm. (fig. 7&) . 



Another colony from Hakipuu was correctly considered by 

 Gulick to be transitional to decipiens proper. Some speci- 

 mens have a white sutural band, and occasionally there is a 

 white line at the periphery (pi. 32, figs. 6 to 6c) . 



Variety ( ?) planospira Pfeiffer. PL 30, fig. 8. 



Achatinella planospira Pfr. has been placed in the syn- 

 onymy of decipiens by Newcomb, who is followed by Hart- 

 mam, Sykes and Thwing. I have seen specimens of form cor- 

 rugata having the same pattern except that the summit is 

 light, while Pfeiffer 's figure shows it dark. The status of the 



