ACHATINELLA C^SIA. 269 



which has a distinct if narrow dark sutural margin. His 

 figure also shows this. A. scitula seems to be merely a color- 

 form of A. cccsia cognata. 



The original descriptions of the forms herein referred to 

 A. ccesia follow. 



. , 



'Achatinella concidens. Shell sinistral, imperforate, ovate- 

 conic, solid, striated, brown banded with white ; apex some- 

 what acute ; spire convexly conic ; suture marginate, white, 

 moderately impressed ; whorls 6y 2 , convex ; columellar fold 

 central, white, moderately developed; aperture truncately 

 oval, white within ; peristome thickened within, with external 

 margin unreflected, arcuate ; columellar margin dilated, ad- 

 nate ; parietal margin wanting. Length 20, breadth 11, length 

 of body-whorl 14 mm. Average weight 4.75 grains. 



"Station, on trees. Habitat, Waimea, Oahu, J. T. G. ; 

 My specimens of this species are more or less bleached and 

 faded. Continued search was made for living specimens, but 

 without success' (Gulick). 



"Achatinella formosa. Shell sinistral, imperforate, acu- 

 minately ovate, solid, shining, striated, white, with two black 

 bands, one entering the aperture, sometimes with the upper 

 part of the whorl of a pale slate color ; apex somewhat acute ; 

 spire convexly conic ; suture marginate, well impressed ; 

 whorls 6%, convex; columellar fold central, white, strong; 

 aperture truncately auriform, white within; peristome thick- 

 ened within ; with external margin unreflected, arcuate, acute ; 

 with columellar margin dilated, adnate ; parietal margin want- 

 ing. Length 20 1 /3, breadth 10%, length of body-whorl 14 

 mm. Average weight 6 grains. 



"Station, on the ki (Cordyline terminalis) and other leaves. 

 Habitat, Waimea, Oahu, J. T. G. ! 



"Var. &. with the two bands uniting in one broad black belt. 



"Var. c, with numerous black spiral lines. 



"A rare species, and of great interest on account of its 

 affinities, which connect it with species so different from each 

 other. A. glauca, delta, phceozona and zonata Nob. are cer- 

 tainly not very similar ; but this species seems to connect itself 

 directly with varieties of each of these species' (Gulick). 



"Achatinella cognata. Shell sinistral, imperforate, ovate 

 conic, solid, shining, striated, of pale rosy fawn color, with 

 a brown sutural band ; apex subacute ; spire convexly conic ; 

 suture marginate, brown, lightly impressed ; whorls 6, slightly 

 convex; columellar fold central, rose-colored, strong; aper- 

 ture truncately auriform, within white lightly tinged with 



