ACHATINELLA C^ESIA. 265 



Waimea. The type of A. casia is figured on pi. 44, fig. 13. 

 The type-specimen is not fully mature, therefore it is rather 

 thin, and reminds one of A. papyracea. It is indistinctly 

 streaked with light pinkish cinnamon on a white ground, with 

 a dusky, interrupted peripheral line below which there is a 

 pale line. Suture margined on the last whorl, of the same 

 color as the shell. The embryonic whorls have a faint yellow- 

 ish tint, the apex being white. Columellar fold white; lip 

 thin, with a pinkish submargin within. The last whorl is 

 slightly compressed laterally, so that it has a somewhat cylin- 

 drical contour, though this is not conspicuous. There is a 

 very minute cleft behind the reflected columellar lip in the 

 type and in other immature shells, but in those fully mature 

 it is closed. 



Another lot from Gulick, no. 1258 coll. Boston Society (pi. 

 44, figs. 14, 15, 16) contains several patterns, all with the 

 same slightly cylindric last whorl, but part of them more 

 solid than the type-specimen, being mature. Color as follows. 



White, with the faintest yellow tint near the lip, which is 

 acute but slightly thickened within. 



White with four brown lines on the last half of the last 

 whorl. 



Yellow, with some obscure lines on the base, lip and colu- 

 mella flesh-tinted. Shell smaller, length 16*4, diam. 9.1 mm. 



The type and sole specimen of A. concidens (pi. 43, fig. 14) 

 is a "dead" shell which has lost its polish by weathering. 

 It is conspicuously streaked with cinnamon, with dashes here 

 and there of darker brown, on a soiled white ground ; the 

 streaks interrupted by a white band below the suture, another 

 at and below the periphery, the lower half of the base being 

 also dirty whitish. Embryonic whorls cinnamon-buff, fading 

 to white at the apex. Length 19.7, diam. 11 mm. This shell 

 was no doubt paler, more gray in life. I think it merely a 

 color-form of cczsia, not a true race. 



The type-specimen of A. formosa (pi. 43, fig. 13, No. 55 

 of type series in Boston Society coll.) is a very beautiful shell. 

 It is solid, more elongate then the type of cczsia, but other- 

 wise not dissimilar in contour. The shell is imperforate and 



