Descriptions of JVew Species of Achatinella. 180 



ate ; columellar margin dilated, thin, vitreous, not appressed ; 

 parietal margin wanting. 



Length 0.25 inch (6£ mill.). Breadth 0.10 inch (2$ mill.). 



Length of body whorl 0.15 inch (1 mill.). 



Average weight 0.09 grain. 



Station.— ~\Jn&ev stones in places not shaded by trees. J. T. G. ! 



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



Remarks. — A slender, delicate, and gracefully formed spe- 

 cies, with which I introduce the following turreted group, 

 though it seems to be more nearly allied in its affinities to A. 

 triticea Nob., which I have placed in the preceding group. 



IV. Achatinella petila. 



Plate VI. Fig. 17. 



T. dextrorsa, perforata, ovato-turrita, tenuiuscula, impolita, fusco- 

 cornea, oblique striata ; apice obtusula, pallida ; spira turrita ; sutura 

 simplici, bene impressa ; anfr. 6, convexis ; columella verticali, fusca, 

 intus levissime plicata ; apertura verticali, subelliptica ; perist. simplici ; 

 marginibus conniventibus ; dextro recto, arcuato; columellari subrefiexo, 

 patente ; parietali angusto, calloso. 



Shell dextral, perforate ; turreted, rather thin, not polished, 

 brown, corneous, obliquely striated ; apex somewhat obtuse, 

 pallid ; spire turreted ; suture simple, well impressed ; whorls 6, 

 convex ; columella vertical, brown, lightly plaited deep within 

 the aperture ; aperture vertical, subelliptical ; peristome simple, 

 with margins joining in an unbroken curve; dextral margin 

 unreflected, arcuate ; columellar margin slightly reflected, not 

 appressed ; parietal margin narrow, callous. 



Length 0-26 inch (6| mill.). Breadth 0.11 inch (2f mill.). 



