Descriptions of ffl&w Species of Achatinella. 197 



dextral margin anteriorly reflected, arcuate ; columellar margin 

 broadly reflected, flattened, not appressed ; parietal margin 

 very thin. 



Length 0.80 inch (20£ mill.) ; breadth 0.41 inch (10f mill.). 



Length of body whorl 0.55 inch (14 mill.). 



Weight 4.50 grains. 



Station. — . . . . ? 



Habitat. — Kawailoa, Oahu. J. T. G. ! 



Remarks. — A rare mouse-colored species, in affinity nearly 

 allied to A. dubia Newc., but in color bearing a striking 

 resemblance to A. glabra Newc, a shell of quite another group, 

 found in the same locality with this. 



26. Achatinella pexa. 



Plate VI. Fig. 26. 



T. sinistrorsa, profuncle perforata, ovato-conica, tenui, nitida, striatula, 

 sub lente obsoletissime decussata, cinerea, albido et fusco-strigata, lineis 

 fuscis spiralibus ornata ; apice subacuta ; spira conica ; sutura simplici, 

 subimpressa ; anfr. 6, convexiusculis ; columella alba, obsolete plicata ; 

 apertura, obliqua, truncato-ovali, intus albido-fusca ; perist. vix incras- 

 sato ; margine externo antice reflexo, arcuato ; columellari dilatato, 

 patente ; parietali nullo. 



Shell sinistral, deeply perforated, ovate-conic, thin, shining, 

 finely striated, microscopically very minutely decussated ; ash- 

 colored, streaked with white and brown, and banded with 

 brown spiral lines ; apex subacute ; spire conical ; suture sim- 

 ple, slightly impressed ; whorls 6, somewhat convex ; columella 

 white, obsoletely plaited ; aperture oblique, truncately oval, 

 light brown within ; peristome scarcely thickened within ; with 

 external margin anteriorly reflected, arcuate ; columellar mar- 

 gin dilated, not appressed ; parietal margin wanting. 



DECEMBER, 1866. 14 Asm. Lto. Nat. Hist. Vol. VI. 



