194 PABTULA, TAHITI. 



acute. Whorls 5%, a little flattened, the last about as long 

 as the spire. Columella plicate above, deep within, then 

 nodulose. Aperture subvertical, oblong, narrow; peristome 

 outwardly scarcely expanded; inwardly provided with an 

 acutely projecting white callus, contracting the aperture; 

 margins subparallel, the right margin a little straightened. 

 Length 16, diam. 8, aperture 6 mm. long inside, 4 wide. 

 (Pfr.). 



Tahiti: "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 speci- 

 mens. It is entirely confined to the south side of the stream 

 which flows through the valley, and circumscribed in a nar- 

 row area about three-fourths of a mile in length. ' ' ( Garrett) . 



Partula nodosa PFEIFPER, Proc. Zool. Soc., 1851, p. 262; 

 Mon. Hel., iii, p. 449; iv, 512; vi, 160; Conchyl. Cab. p. 266, 

 pi. 64, f. 1, 2. Pease, Proe. Zool. Soc., 1871, p. 473. 

 SCHMELTZ, Cat. Mus. Grodeff., v, p. 92. HABTMAN, Cat. Part,, 

 p. 10; Obs. Gten. Part., Bull. Mus. Comp. Zool., ix, pp. 184, 

 188, 195. GABBETT, J. A. N. S. ix, 1884, p. 65. Partula trili- 

 neata PEASE, Amer. Jour. Conch., 1866, p. 195; 1867, p. 81, 

 pi. 1, fig. 1. PFR., Monogr. viii, p. 195. Partula nodosa var. 

 trilineata PEASE, Proc. Zool. Soc., 1871, p. 473. Partula no- 

 dosa var. sinistralis MAYEB, Some species of Partula from 

 Tahiti in Mem. Mus. Comp. Zool. xxvi, no. 2, Jan. 1902, p. 

 127, figs. 14, 15, 14a, 150. 



P. nodosa stands near P. suturalis of Moorea, which doubt- 

 less arose from the same ancestral stock. In Tahiti it has no 

 little resemblance to certain forms of P. lignaria, especially 

 those with many streaks and a single dark belt, many of 

 which show a more or less developed nodule on the columella, 

 such as is characteristic of P. nodosa. 



The typical P. nodosa, pi. 25, figs. 12, 13, was the dark 

 reddish-brown or chestnut-brown shell, with a wide cream- 

 white band below the suture on the last one or two whorls. 



