Descriptions of New Species of Achatinella. 237 



rately impressed ; dark brown ; whorls 6, convex ; columellar 

 fold central, white or rose, moderately developed ; aperture 

 truncately ellipsoidal, white within ; peristome slightly thick- 

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

 columellar margin dilated, adnate ; parietal margin wanting. 



Length 0.70 inch (18 mill.) ; breadth 0.37 inch (9f millim.). 



Length of body whorl 0.45 inch (.11$ mill.). 



Average weight 4.00 grains. 



Station. — On the leaves of the Pua, Ahakea, and other trees. 

 LT. G.! 



Habitat. — "Waimea, Pupukea, Waialei, and Kahuku, Oahu. 

 J. T. G. ! Kaawa, Oahu. J. S. Emerson ! 



Remarks. — This and A. sonata Nob., which inhabit the 

 same valleys, correspond to A. curta and A. recta Newc, 

 which are similarly associated in the valleys of "Waialua, an 

 adjoining district of the same island. 



57. Achatinella albescens. 



Plate VIII. Fig. 57. 



T. sinistrorsa, interdum dextrorsa, imperforata, ovato-conica, solida, 

 nitida, striata, alba, interdum lutescente ; apice acutiuscula ; spira 

 convexo-conica ; sutura marginata, valide impressa ; anfr. 6, infra sutu- 

 ram turaidiusculis, in medio subplanatis ; plica columellari mediana, 

 alba, valida, ; apertura, truncato-auriformi, intus alba, ; perist. intus in- 

 crassato ; margine externo recto, leviter arcuato ; columellari dilatato, 

 adnato ; parietali nullo. 



Shell sinistral, sometimes dextral, imperforate, ovate-conic, 

 solid, shining, striated, white or sometimes yellowish; apex 

 somewhat acute ; spire convexly conical ; suture marginate, 

 well' impressed ; whorls 6, somewhat swollen beneath the 

 suture, and slightly flattened in the middle ; columellar fold 

 central, white, strong ; aperture truncately auriform, white 



