242 PARTULA, RAIATEA AND TAHAA. 



Illustrated from specimens received from Garrett. Others 

 from Pease are before me. This snail lives under cover on the 

 ground, and the shell is less glossy than navigatoria or faba 

 which differ from fused and vittata chiefly by their arboreal 

 habits and brighter shells. The lip is usually expanded more 

 than in vittata, which replaces fusca on the southwest. P. 

 fusca occasionally has a small parietal tooth, 'but in vittata 

 the tooth is almost invariable in fully adult shells. 



38a. P. F. VITTATA Pease. PI. 17, fig. 16. 



The shape of the typical vittata is oblong-conic, more or 

 less compressedly umbilicated, and the spire, which equals 

 half the length of the shell, has straight outlines. The last 

 whorl is not angular in front of the aperture. The ample, 

 oblong aperture is 'considerably contracted by the intrusion 

 of white callus on the inner margin of the peristome, and the 

 sides are nearly parallel. The peristome is rather thin, 

 widely expanded and usually stained with brownish purple. 

 The white callus does not extend to the upper end of the 

 lip, leaving a shallow sinus. The columella is flattened, not 

 calloused or nodose, and reflected over the umbilicus. The 

 color is whitish, yellowish corneous, fulvous or horn-color, fre- 

 quently with the basal third of the 'body and a sutural band 

 chestnut-color. Sometimes the apex is 'black or purple-black. 

 The parietal tooth, though small, is constant, 'but so far 

 within that it is hardly visible in a front view. 



Length 23, diam. 13 mm. (fig. 16). 



Length 24, diam. 12 mm. (Pease) . 



Length 25, diam. 11 mm. (Garrett, maximum size). 



Society Islands : Restricted to the higher portions of Toloa 

 valley, on the west coast of Raiatea, not uncommon under 

 decaying vegetation. (Garrett). 



Partula vittata PEASE, Amer. Jour. Conch., 1866, p. 194; 

 Proc. Zool. Soc., 1871, p. 473. PFEIFFER, Mon. Hel., viii, p. 

 200. HARTMAN, Cat. Part., p. 7 ; Obs. Gen. Part., Bull. Mus. 

 Comp. Zool., ix, p. 169 (excl. microstoma) . GARRETT, Journ. 

 A. N. S. Phila., ix, 1884, p. 75, pi. 3, f. 56. Partula approxi- 



