10 Descriptions of New Species of Achatinella. 



15. Achatinella Helena. 



Testa sinistrorsa, ovato-conica, striis exile decussata, rufa, lineis zic- 

 zac albis, latis, longitudinalibus alternante, interdum anfractu ultimo 

 albo-fasciato ; anfractibus quinque, ventricosis ; sutura profunda, sim- 

 plici ; apertura ovata ; columella sub-callosa. 



Shell sinistral, ovate-conical, with finely decussating striae, 

 rufous, alternating with broad longitudinal zig-zag white lines 

 covering the entire shell ; the last whirl often encircled by a 

 white band ; whorls five, rounded ; suture deep, simple : aper- 

 ture ovate, columella slightly callous. 



Length 0.5 inch. Breadth 0.22 inch. 



Habitat. Molokai. 



Remarks. This beautiful shell is dedicated to the lady who 

 delineated the species herein described, and prepared them for 

 publication. 



16. Achatinella laMata. 



Testa dextrorsa, elongata, subovata, plumbea ; anfractibus septem, 

 planis, tertio angustiori, pallidiori, ultimo fascia alba suturali; sutura 

 submarginata ; apertura elongato-ovata ; columella brevi, in dentem 

 prominentem, plicatum desinente ; labio incrassato, albido, callo interne 

 centrali munito. 



Shell dextral, elongate-ovoid, plumbeous except the third 

 whorl, the margin of the outer lip, and along the suture of the 

 last whorl, which are white ; whorls seven, flattened ; the third 

 narrower than the second : suture slightly margined below ; 

 aperture elongate-ovate : columella short, with a strong, plaited 

 projecting tooth ; lip thickened, white, with a central internal 

 callosity. 

 t Length 0.5 inch. Breadth 0.21 inch. 



Habitat. Oahu. 



