Descriptions of New Species of Achatinella. 249 



rugose ; columellar fold central, white, strong ; aperture trun- 

 cately auriform, white within ; peristome thickened within, 

 white, sometimes margined with brown ; with external margin 

 scarcely reflected anteriorly ; columellar margin dilated, 

 adnate ; parietal margin wanting. 



Length 0.72 inch (18i millim.) ; breadth 0.40 inch (10 millim.). 



Length of body whorl 0.50 inch (13 millim.). 



Average weight 5.30 grains. 



Station. — On trees. J. T. G. ! 

 Habitat — Hakipu, Oahu. J. T. G. ! 



Remarks. — The color is often nearly black, and sometimes 

 reddish yellow. 



It has been placed by Dr. Kewcomb with his A. decipiens, 

 but is more nearly allied to A. rugosa Newc. From the latter 

 it differs in its usually white lip, and the more convex outlines 

 of its spire. The color also fades gradually towards the apex, 

 instead of terminating abruptly in white, as in A. rugosa. 

 Sinistral specimens have been found. 



67. Achatinella rotunda. 



Plate VIII. Fig. 67. 



T. sinistrorsa, imperforate, ovata, basi oblique truncata, solida, nitida, 

 striata, nigro-castanea, infra suturam fulvo vel albo late cincta ; apice 

 obtusa, castanea ; spira convexo-conica ; sutura marginata, nigra, bene 

 impressa ; anfr. 6, convexis ; ultimo magno, rotundato ; plica columellari 

 mediana, albida, valida ; apertura, obliqua, truncato-auriformi ; perist. 

 nigro, intus subincrassato ; margine externo antice subreflexo, arcuato ; 

 columellari dilatato, adnato ; parietali nullo. 



Shell sinistral, imperforate, ovate, obliquely truncated at the 

 base, solid, shining, striated, of black chestnut color, with a 

 broad white or yellowish chestnut band beneath the suture ; 

 apex obtuse, chestnut ; spire convexly conic ; suture margined, 

 black, well impressed ; whorls 6, convex ; the last large, 



