Descriptions of New Species of Achatinella. 231 



50. Achatinella delta. 



Plate VIIL Fig. 50. 



T. sinistrorsa, imperforata, cornea, basi oblique truncata, solida, nitida, 

 striata, lutescente, fasciis 2 vel 3 cinereo-fuscis cincta ; apicc obtusula, 

 alba; spira conica; sutura, marginata, leviter impressa ; anfr. 5|- sub- 

 convexis ; plica columellari mediana, alba, valida ; apertura truncato- 

 auriformi, intus alba ; perist. intus subincrassato ; margine externo recto 

 arcuato, acuto ; columellari dilatato, adnato, albo ; parietali nullo. 



Shell sinistral, imperforate, conic, obliquely truncated at the 

 base, solid, shining, striated, yellow at the base, paler above, 

 with 2 or 3 ash-brown bands ; apex rather obtuse, white ; spire 

 conic ; suture marginate, lightly impressed ; whorls 5£, slightly 

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

 cately auriform, white within ; peristome thickened within ; 

 with external margin unreflected, arcuate, acute ; columellar 

 margin dilated, adnate, white ; parietal margin wanting. 



Length 0.63 inch (16 millim.) ; breadth 0.42 inch (10| millim. '). 



Length of body whorl 0.46 inch (11| millim.). 



Average weight 4.70 grains. 



Station. — On trees and shrubs. J. T. G. ! 

 Habitat. — Kalaikoa, Ahonui, "Wahiawa, and Helemanu, 

 Oahu. J.T. G. ! 



Var. h. — "Without bands. 



Var. c. — "With one black spiral line. 



Var. d. — "With two broad black bands. 



Remarks. — In "Wahiawa, which is the metropolis of the 

 species, var. a is most abundant ; var. b is more widely diffused, 

 being occasionally found in each of the above-mentioned 

 localities ; vars. c and d are very rare ; the former approaches 

 A. contracta Nob., and the latter passes into an unusual 

 variety of A. Emersonii Newc. 



FEBKUAEY, 1858- Yl Alw - Ly0, Nat - ni8T - VoL ' VI - 



