88 MOLLUSCA. 
albido, incrassato, prorsum arcuato; columella truncata, sed vix 
plicata. 
Achatinella acuminata, Goutp; Proceed. Boston Soc. Nat. Hist., 
ii. 200. March 1847. Expedition Shells, 35. 
SHELL small, slender, turreted, elongated, with an obtuse apex, 
translucent, thin, very smooth and shining, of a greenish amber- 
colour. Spire elevated, obtuse, pointed, of six very oblique, slightly 
convex whorls, the last of which is nearly two-thirds the length of 
the shell. Suture distinct, and faintly margined and crenulated. 
Aperture very narrow, one-third the length of the shell, rounded at 
base, and acute behind. Lip simple, whitish, thickened within, and 
arching forward. Columella without a conspicuous fold bordering the 
truncation. 
Length half an inch; breadth one-eighth of an inch. 
Inhabits Kauai, Sandwich Islands. 
More elongated, and with more oblique whorls than other species. 
In its form, colour, and transparency, it may be compared with Physa 
hypnorum. 
Figure 100, the shell enlarged; 100 a, natural size. 
There are several species of shells peculiar to the Sandwich Islands 
which have the same elongated form and delicate structure, with a 
polished surface, and the mere semblance of a columellar fold. I 
propose to designate this group by the name of LEPTACHATINA (Asmzog, 
and Acuatina). It is intermediate between true Achatina and Achati- 
nella. ‘The three following species also belong to this group. 
ACHATINELLA accincTa (Mighels) Gould. 
Testa ovato-conica, solidula, obliqué striata, sordidé cornea: sptra 
conica, obtusiuscula ; anfractibus sex cum dimidio planulatis, ultimo 
trientem longitudinis vix superante; sutura marginata: apertura 
semrovalts ; labro simplict, obtuso ; columellé arcuata, plicato-torta. 
