242 Descriptions of New Species of Achatinella. 



convcxo-conica ; sutura obsolete marginata, modice impressa ; anfr. 0, 

 convexis ; plica columellari mediana, alba, sublamelliformi, bene torta ; 

 apertura sinuato-ovali, intus alba ; perist. intus subincrassato ; maxgirie 

 externo recto, arcuato ; columellari dilatato, adoato ; parietal! nullo. 



Shell sinistral, scarcely perforate, ovate conic, rather thin, 

 shining, striated, fawn colored, with obscure brown spiral lines; 

 apex subacute ; spire convexly conic ; suture obsoletely mar- 

 gined, moderately impressed ; whorls G, convex ; columellar 

 fold central, white, sublamelliform, well twisted ; aperture sinu- 

 ately oval, white within ; peristome slightly thickened within ; 

 with external margin unreflected, arcuate ; columellar margin 

 dilated, adnate ; parietal margin wanting. 



Length 0.78 inch (20 millim.); breadth 0.45 inch (llf millim.). 



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



Average weight 3.80 grains. 



Station. — . . . . ? It is probably arboreal. 

 Habitat. — Kahana, Oahu : very rare. J. T. G-. 



Remarks. — I have ventured to separate this from A. ovata 

 with which Dr. Newcomb placed it, who supposed that its 

 lack of some of the important characteristics of that species 

 was owing to the immaturity of specimens. But even if the speci- 

 mens were all immature, unless my eye is greatly deceived in 

 tracing its affinities, it may be safely considered more nearly 

 allied to A. Buddii Newc.,or indeed to all the numerous species 

 of that section of the genus, than to any one of the species of 

 the Sect. Bulimella Pfr., to which A. ovata JSTewc. belongs. 



Notes. — I have now given the descriptions of twenty-three 

 species, belonging to the Sect. Aciiatinellastkum Pfr. com- 

 mencing with A. phaiozona and closing with A. cervina. That 

 they are closely related, will be seen from the similarity of the 

 descriptions, in which many characters appear as common to all. 



The variation of the species, both in form and color, and the 



