196 Descriptions of New Species of Achatmella. 



apex obtuse ; spire convexly conical ; suture simple, moderately 

 impressed ; whorls 6, rather convex ; columella with a light 

 internal plait; aperture pyriform; peristome simple, unre- 

 flected ; with coluinellar margin narrow, adnate ; parietal mar- 

 gin wanting. 



Length 0.25 inch (6$ mill.). Breadth 0.12 inch (3 mill.). 



Length of body whorl 0.16 inch (4 mill.). 



Average weight 0.10 grain. 



Station.' — . . . ? Undoubtedly on the ground. 



Habitat. — Hawaiian Islands. ! 



Remarks. — Nearly of the size and color of A. granifera 

 Nob., but of a more cylindrically oblong shape, with narrower 

 base. 



25. Acliatinella plaiystyla. 



Plate VI. Fig. 25. 



T. dextrorsa, perforata, elongato-ovata, tenuiuscula, nitida, striatula, 

 sub lente obsolctissimc decussatula, basi cinereo, supernc albido-fusca ; 

 apice obtusula ; spira convexo-conica ; sutura vix marginata, bene im- 

 pressa ; anfr. 6£, convexis; plica eolumcllari mediant, alba, subtorta; 

 apertura parum obliqua, scmiovali, intus eerulco-albida ; perist. intus 

 incrassato, flavescente ; marginc dcxtro antice reliexo, arcuato ; eolu- 

 mcllari late reflexo, subplano, patente ; parietali temiissimo. 



{Shell dcxtral, perforate, elongately ovate, rather thin, shining, 

 finely striated, microscopically very faintly decussated, pale 

 brown above, ash-brown at the base ; apex rather obtuse ; spire 

 convexly conic ; suture scarcely marginate, well impressed • 

 whorls 64, convex ; columellar fold central, white, slightly 

 twisted ; aperture a little oblique, semioval, bluish white 

 within ; peristome yellowish white, thickened within ; with 



