PARTULA, RAIATEA AND TAHAA. 219 



straw-colored with faintly darker or greenish streaks, the~ 

 spire paler or whitish, apex yellow or reddish tinted. Whorls 

 51/2, but slightly convex, separated by a minutely roughened, 

 white-edged suture ; last whorl paler or white behind the outer 

 lip. Aperture somewhat oblique, auriform, the lip well ex- 

 panded, white, flattened or sloping inward, having a rather 

 strong callous ledge within, which terminates upward in a 

 wide tubercle, above which it is narrow and excavated. Colu- 

 mella vertical, very little dilated at the insertion, where it 

 is somewhat guttered,- an oblong callous nodule below the 

 gutter. Parietal callus thin and transparent, not toothed. 

 Length 23, diam. 12.5 mm. 



Raiatea : ' ' restricted to a single valley called Uparu, on the 

 west coast of Raiatea; arboreal. I found it abundant in a 

 limited area in the upper portion of the valley. A few 

 stragglers occurred lower down in company with faba and 

 garrettii. ' ' ( Garrett ) . 



Partula citrina PEASE, Amer. Jour. Conch., 1866, p. 195; 

 Proc. Zool. Soc., 1871, p. 473. SCHMELTZ, Cat. Mus. Godeff., 

 vi, p. 81. PFEIFFER, Mon. Hel., viii, p. 200. GARRETT, Journ. 

 A. N. S. Phila., ix, 1884, p. 64, pi. 3, f. 52. Partula faba 

 var. CARPENTER, Proc. Zool. Soc., 1864, p. 675. HARTMAN, 

 Cat. Part., p. 6 ; Obs. Gen. Part., Bull. Mus. Comp. Zool., ix, 

 pp. 180, 195. 



This species stands very close to P. dentifera and P. im- 

 perforata. It differs from dentifera by the flattened or in- 

 wardly sloping lip, which is not keeled on the face, by the 

 less prominent tubercle within the outer lip, and by the more 

 emphatic nodule on the columella. Compared with P. im- 

 perforata, it differs by the absence of a parietal tooth, the 

 usually lighter color, larger size and slightly open umbilicus, 

 all being inconstant characters. Garrett writes as follows: 

 "Though considered by some authors to be a variety of P. 

 faba, I am, nevertheless, fully 'Convinced of its specific value. 

 When I first discovered it in 1861, I took but few examples, 

 in consequence of not penetrating far enough into the valley 

 to find its headquarters. A more extended research in 1873 



