TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 65 
strongly labiated, slightly dentate and distinctly emarginate above. ‘The slightly 
gibbous columella is reflected over the small compressed perforation. 
Its uniform straw-yellow color, more slender form, smaller perforation, more 
reflected columella, and more decided labial tooth, and profounder emargination, will 
distinguish it from the very variable faba. 
P. noposa, Pfeiffer. 
Partula nodosa, Pfeiffer, Proc. Zool. Soe., 1851, p. 262; Mon. Hel., iii, p. 449. Pease, Proc. 
Zool. Soc., 1871, p. 473. Paetel, Cat. Conch., p. 104. Schmeltz, Cat. Mus. Godeff., v, p. 
92. (Helena) Hartman, Cat. Part., p. 10; Obs. Gen. Part., Bul. Mus. Com. Zool., ix, pp. 
184, 188, 195. 
Partula trilineata, Pease, Amer. Jour. Conch., 1866, p. 195 ; 1867, p. 81, Pl. I, fig. 1. 
Partula nodosa, var. trilineata, Pease, Proc. Zool. Soe., 1871, p. 473. 
This beautiful arboreal species is restricted to a limited area about two miles up 
Punaavia valley on the west coast of Tahiti. 
I first discovered the location in 1861, and gathered about three hundred examples. 
On a subsequent visit, nine years later, I secured over eight hundred specimens. It 
is entirely confined to the south side of the stream which flows through the valley, 
and circumscribed in a narrow area about three-fourths of a mile in length. 
When Mr. Pease described his ¢rilineata, he gave the correct locality ; but, in his 
list of Polynesian land shells, he wrongly assigns it to Moorea. Dr. Pfeiffer gives 
Tahiti and Navigator Islands as its habitat. The type is purely Tahitian, and does 
not occur at the latter group. 
It may be characterized by its ovately conical form, solid texture, constant parietal 
tooth, nodose columella, and widely expanded white peristome, which is flatly convex, 
very slightly constricted above and strongly lipped within. The color is creamy 
white or yellow-corneous, generally with narrow, longitudinal strigations of a brownish 
color, and ornamented with three revolving, narrow, reddish brown bands, About one 
in two hundred is sinistral. Bandless varieties are not infrequent, and some are fulvous 
or light chestnut-brown, with a pale narrow sutural band. 
P. HYALINA, Broderip. 
Partula hyalina, Broderip, Proc. Zool. Soc., 1832, p. 32. Muller, Syn. Test., p. 82. Reeve, 
Conch. Syst., ii, Pl CLX XV, figs. 1,2. Jay, Cat. Shells (1839), p.57. Reeve, Conch. 
Icon., Pl. III, fig. 14. Pfeiffer, Mon. Hel., iii, p. 451. Pease, Proc. Zool. Soc., 1871, p. 
473. Paetel, Cat. Conch., p. 104. Schmeltz, Cat. Mus. Godeff., v, p. 92. Garrett, Proc. 
Acad. Nat. Sci. Phila., 1879, p. 18; Jour. Acad. Nat. Sci. Phila., 1881, p. 396. (Pasithea) 
Hartman, Cat. Part., p. 2; Obs. Gen. Part., Bul. Mus. Com. Zool., ix, p. 183. 
Bulinus hyalinus, Sowerby, Conch. Illus., fig. 9. 
Bulimus hyalinus, Lam., Ed. Desh., p. 284. 
Partulus hyalinus, Beck, Index Moll., p. 57. 
This well-known arboreal species has its metropolis or specific centre in the Austral 
group, some three hundred miles south of Tahiti. It occurs also on Mangaia, one of 
