4G MOLLUSCA. 
Diameter one-eighth of an inch; axis one-tenth of an inch. 
Inhabits Metia, or Aurora Island. Couthouy. 
A small, pellucid shell, somewhat like H. electrina, but more globu- 
lar. It is of the same size as H. cicercula, but is more fragile, has one 
whorl less, a more depressed spire, and a different aperture. 
Figures 60, 60a, 600, three views of the shell, enlarged; 60c, 
natural size. 
HELix cuLTrata (Gould). 
Testa parva, orlicularis, depressa, glaberrima, lucida, fusco-viridis, infra 
rotundata, in foveam umbilicalem devexa, imperforata : spira anfrac- 
tibus quinque convexis, ultimo superné carinato ; apice obtuso ; sutura 
marginata: apertura angusta, lunata ; labro simplict ; columella obli- 
qua, callosa, alba, planulata, inflexd, inferné dentem simulante. 
Helix cultrata, Goutp; Proceed. Boston Soc. Nat. Hist., ii. 172. 
Sept. 1846. Expedition Shells, 20. Preirrer; Monog. Helic. Viv., 
1 Ghee 
SHELL small, depressed-orbicular, very smooth and glistening, trans- 
lucent, of a dusky-green colour. Whorls five, closely arranged, and 
forming a low, arched spire, the outer whorl carinate superiorly, on the 
plane of the interior whorls: suture delicate, with a fine line revolving 
near it. Beneath convex, broadly rounded at margin, and at the 
centre forming a slight depression. Aperture narrowed, lunate, the 
lip simple, columellar portion oblique, inflexed, opaque white, forming 
a broad, flat plate, ending below in a tooth-like process; callus across 
the penultimate whorl abundant. 
Diameter nine-fortieths of an inch; axis one-eighth of an inch. 
Inhabits Tahiti and Eimeo, Society Islands. Couthouy. 
A beautiful, smooth, lenticular, dark-green shell, not unlike H. z- 
terna, Say, distinguished by its curious broad, white, inflected, colu- 
