22 tebrkstkial mollusca inhabiting society islands. 
I„ trochifoon shape, acutely angular body, and conspicuous peculiar colmncllnr 
plait, will determine it. 
“Tii ITic.!’;" s;!!^!, p. CCS. Pfcnsr, Mo„. He,., v, p. 86. 
Trochomorpha obconica, Pease, Proc. Zool. Soc., 1871, p. 475. 
Nanina obconica, Schmeltz, Cat. Mus. Godeff., v, p. 207. 
This species is peculiar to Raiatea, where it is very local and somewhat rare. It 
occurs in the higher portions of two valleys, one on the east and the otlier on le 
west side of the island. _ . 
Its mo.st essential characters are its depressed-trochoid form, acute carination, sma 
but pervious umbilicus, and fine crowded striae. My largest example is 8 mill, in 
diameter. 
T. CALCUI/O.SA, Gould. 
Helix calculosa, Gould, Expl. Ex. Shells, p. 48, PI. V, fig. 63. Pfeiffer, Mon. Ilel., iii, p. 41. 
Zonites (Conulus) calculosus, H. and A. Adam.s, Gen. Moll., ii, p. 116. 
Nanina calculosa, Gray, Cat. Pulm., p. 126. Schmeltz, Cat. Mus. Godeff., v, p. 91. 
Nanina {Trochomorpha) calculosa, Albers, Hel., p. 60. 
Not uncommon on foliage and is diffused throughout the group, ranging from the 
lowlands near the seashore to about 1 000 feet above sea-level. I also obtained many 
examples on Dominique, one of the Marquesas Islands, and a few at INIalolo, one of the 
Viti group. Its exi.stence in the latter location is the more remarkable as it has not 
been observed on any of the intermediate islands. 
My largest exam])les, wliich are 4| mill, in diam., and a trifle less in height, are 
larger tlian Gould’s specimens. It may readily be distinguished by its globose- 
pyramidal form, angulate body-whorl and oblique aperture. The umbilicus, though 
generally clo.sed, is sometimes punctiform, and the columella reflexed. 
It is not included in INIr. Pease’s List of Poljmesian Land Shells. 
T. SUBRUGOSA, Garrett. Plate II, figs. 38, 38 a, 38 b, 38 c, 38 d. 
Shell small, imperforate, globose-conic, thin, subpellucid, fulvous ; upper surface 
with crowded, slightly oblique, plicate strise ; spire depressed-conic, apex planulate ; 
suture linearly impressed ; base convex, smooth, glossy, indented at the axis ; whorls 
4-4i, strongly convex, slowly and regularly increasing, last one narrow, rounded, not 
descending in front, periphery with a thread-like keel; aperture slightlv oblique, 
transversely ovate-luniform ; peristome thin, simple, regularly curved, with remote’ 
margins ; columella slightly thickened with callus. 
Major^^diam. 2^, height 2 mill. 
IlaJ ). — Tahiti and Moorea. 
Tim small Bcdptmcd siKcies is somewhat rare. It was fomd under stones on the 
northwest side of lahiti, at an elevation of about 1000 feet. A few examples were 
