TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. dl 
P. MAUPIENSIs, Garrett. 
Pitys Maupiensis, Garrett, Proc. Cal. Acad. Sciences, 1872, p. 204; Proc. Acad. Nat. Sci. 
Phil., 1873, p. 233, Pl. LI, fig. 64. 
Patula Maupitiensis, Schmeltz, Cat. Mus. Godeff., v, p. 93. 
Helix Maupitiensis, Pfeiffer, Mon. Hel., vii, p. 481. 
Very common, and confined to the small island of Maupiti. 
It may be distinguished from any other Polynesian species by its fine, crowded, 
elevated (not costulate) striae, convex spire, numerous very narrow rounded whorls, 
numerous internal lami and deep vertical umbilicus. The parietal lamine are three, 
rarely two, and sometimes the one on the columellar region is obsolete. Besides the 
usual four palatal lamin, there exist, sometimes, finer and shorter intermediate ones. 
P. PARVIDENS, Pease. Plate II, figs. 14, 14a, 145, 14 ¢. 
Helix parvidens, Pease, Proc. Zool. Soc., 1861, p. 243. Pfeiffer, Mon. Hel., v, p. 220. 
Pitys parvidens, Pease, Proc. Zool. Soe., 1871, p. 474. 
Patula incerta, ‘‘ Mousson,” Schmeltz, Cat. Mus. Godeff., v, p. 93. 
Helix incerta, Pfeiffer, Mon. Hel., vii, p. 481. 
Very abundant and confined to Tahiti, Moorea and Huaheine. Examples from 
the three different localities are precisely alike as regards the character of the fine, 
rib-like striae, size of the umbilicus and shape of the spire. ‘There are generally two, 
rarely three, parietal lamine, and usually four, sometimes five in the palate. Tahiti 
and Moorea specimens are a little larger and darker-colored than those from Huaheine, 
which latter have a cinereous base. 
P. coNsoBRINA, Garrett. Plate II, figs. 17, 17 a, 176, 17 e. 
Shell umbilicated, thin, orbicular, depressed, radiately striated with very fine, 
crowded, nearly straight, membraneous riblets; yellowish horn-color, tessellated and 
striped with reddish brown; spire planulate ; suture channeled; whorls six, very narrow, 
convexly rounded, subangulate next to the suture, slowly and regularly increasing, the 
last one not deflected in front, much deeper than wide, obtusely rounded on the 
periphery ; base convex ; umbilicus perspective, showing all the whorls, nearly a third. 
the greater diameter of the shell; aperture vertical, narrow, irregularly orbicular- 
lunate ; parietal region with four (very rarely three), and the palate with from seven 
to nine lamine ; peristome thin, straight, simple with remote margins; columella with 
or without a lamelliform plait. 
Major diam. 3, height 14 mill. 
Hab.—Huaheine Island, , 
Rare and peculiar to one valley, The spire is more planulate and the body-whorl 
deeper than parvidens. It also has one more whorl, and the lamin are much more 
numerous than in the latter species. 
P. suptiiis, Garrett. Plate II, figs. 15, 15 a, 150, 15. 
Shell umbilicated, orbicular, depressed, thin, yellowish corneous, tessellated and 
