190 Descriptions of New Sj>ecies of Achatmella. 



Length of bod y whorl 0.1-4 inch (3£ mill.). 

 Average weight 0.09 grain. 



Station. — Under stones. J. T. G. ! 



Hahitat. — Dry rocky regions of Koko on the eastern end of 

 Oahu. J. T. G. ! 



Remarks. — A small unpretending species quite unlike any 

 heretofore described. In structure and in the character of the 

 upper whorls it somewhat resembles Bulimus Sandwicensis 

 Pfr. ; but it is much smaller, with fewer whorls, and has a 

 plaited columella. It is more closely allied to A. odogyrata 

 Nob., which inhabits the damp wooded regions of Palolo, and 

 is a larger species with more numerous whorls. 



18. Achatinella octogyrata. 



Plate VI. Fig. 18. 



T. dextrorsa, vix perforata; ovato-turrita, tenui, nitidula, translucida, 

 fuseo-cornea, levissime sed regulariter striata ; apice obtusa, pallida ; 

 spira cornea, subeonvexa ; sutura simplici, modiee impressa; anfr. 8, 

 convexiusculis ; columella pallid'e i'usca, leviter plicata ; apertura subpy- 

 riformi ; pcrist. simplici ; margine dextro recto, tenui, leviter arcuato ; 

 columellari reflexo, subpatente ; parietali nullo. 



Shell dextral, scarcely perforate, ovately turreted, thin, some- 

 what shining, translucent, dark corneous, very finely but regu- 

 larly striated ; apex obtuse, pallid ; spire conical, with outlines 

 slightly convex ; suture simple, moderately impressed ; whorls 

 8, somewhat convex ; columella light brown, with a slight fold ; 

 aperture subpyriform ; peristome simple ; with dextral margin 

 unreflccted, thin, lightly arcuate; columellar margin reflected, 

 parietal margin wanting. 



