Descriptions of New Species of Achatinella. 199 



Habitat — Lanai, one of the Hawaiian Islands. S. T. Alex- 

 ander. ! 



Remarks. — A rare shell allied to A. variabilis Newc, but 

 well characterized as a distinct species. 



28. Achatinella eburnea. 



Plate VI. Figs. 28 a and 28 k t 



T. sinistrorsa, plerumque perforata, ovato-conica, solidula, nitida, striata, 

 minutissime decussata, eburnea; apice acutiuscula; spira, concavo-conica ; 

 sutura submarginata, leviter impressa, ; anfr. 6, subconvexis ; ultimo 

 magno, oblique producto, supra aperturam angulato ; plica, columellari 

 mediana, alba, valida, fere transversa : apertura obliqua truncato-auri- 

 formi, intus alba, : perist. intus incrassato ; raargine externo antice 

 reflexo, arcuato ; columellari dilatato, subpatente ; parietali nullo. 



Shell sinistral, usually perforate, ovate-conic, somewhat solid, 

 shining, striated, very minutely decussated, ivory white ; apex 

 rather acute ; spire concavely conical ; suture slightly mar- 

 gined, lightly impressed ; whorls 6, slightly convex ; the last 

 large, obliquely produced, and angulated above the aperture ; 

 columellar fold central, white, strong, nearly transverse ; aperr 

 ture oblique, truncately auriform, white within ; peristome 

 thickened ; with external margin reflected anteriorly, arcuate ; 

 columellar margin dilated, slightly detached ; parietal margin 

 wanting. 



Length 0.95 inch (24 mill.) ; breadth 0.51 inch (14 mill.). 



Length of body whorl 0.66 inch (17 mill.). 



Average weight 9.00 grains ; greatest weight 13.00 grains. 



Station. — On the trunks of trees, quite exposed. E. Bailey. ! 

 Habitat. — Honuaula, E. Maui. E. Bailey. ! 



Yar. b. — Brownish yellow, with a white girdle on the peri- 

 phery of the last whorl, waved with white and yellow on the 

 third whorl. 



