20 TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
by the fine periphery-keel. The beautiful oblique strive are confined to the upper surface, 
the lower being smooth and more glossy. The axis is more or less distinctly punctate. 
The slightly oblique aperture is angulate-lunate. 
The crowded, regular, raised striz and delicate filiform keel will at once distin- 
guish it. 
M. Discorpr#, Garrett. Plate II, figs. 85, 35 a, 35. 
Microcystis Discordiz, Garrett, Jour. Phil. Acad. Nat. Sci., 1881, p. 383. 
Nanina subtilis, Schmeltz (not of Anton), Cat. Mus. Godeff., v, p. 91. 
Abundant under damp rotten wood, and ranges throughout the group. It is 
equally as common at the Cook’s or Harvey Islands. A few specimens were taken by 
me at the Marquesas group. 
A small, fragile species, about the size of normalis, with a more or less distinctly 
angulate body-whorl, smooth upper surface and lighter colored than the latter. 
M. cuntrata, Gould. 
Helix cultrata, Gould, Proc. Bost. Soc. Nat. Hist., 1846, p. 172; Expl. Ex. Shells, p. 46, fig. 
59. Pfeiffer, Mon. Hel.,i, p. 37; (Zrepta) Vers., p. 128. 
Sagda cultrata (Gastrodon), H. and A. Adams, Gen. Moll., ii, p. 113. 
Nanina cultrata, Gray, Cat. Pulm., p. 130. (Microcystis) Albers, Hel., p. 49. Bland & 
Binney, Amer. Jour. Conch., 1871, p. 189 (dentition). 
Helicopsis cultrata, Pease, Proc. Zool. Soc., 1871, p. 475. 
In 1862, I found examples of this species amongst decaying vegetation in Tahiti, 
but cannot state the precise locality. 
It is a depressed, orbicular, very shining species, 6 mill. in diameter, with five 
whorls, the last one carinated and the columella dentated. 
M. anGustivotuta, Garrett. Plate IT, figs. 34, 34a, 34. 
Shell small, orbicular, depressed, imperforate, thin, smooth, shining, pale amber- 
color, with or without small, irregular opaque-white spots; spire convex, apex 
depressed ; suture faintly impressed, narrowly margined; whorls 55-6, subplaniform, 
narrow, slowly and regularly increasing, last one depressed, not descending in front, 
periphery subangulate; base flatly convex, deeply indented at the axis; aperture 
nearly vertical, very narrow, luniform, much wider than deep; peristome thin, simple, 
with very remote margins; columella small, very oblique. 
Major diam. 44, lesser diam. 4, height 25 mill. 
Hab.—Moorea Island. 
A few examples were found under damp rotten wood on the northeast part of the 
island. 
Its most obvious characters are its depressed form, numerous, narrow whorls, sub- 
angulate periphery, narrow aperture and indented base. 
