PARTULA, RAIATEA AND TAHAA. 239 



A subvariety of amanda has been called var. dubia Garrett- 

 (pi. 17, figs. 4, 8) but that name was already in use for a 

 Tahitian form of the otaheitana group. It is yellow with a 

 white spire, white lip, and invariably has a parietal tooth. 

 Some specimens have a chestnut umbilical area, or are some- 

 what suffused and streaked with fulvous, and the apex is 

 pinkish brown. This form is found in some valleys on the 

 north coast. 



37. P. NAVIGATORIA (Pfeiffer). PI. 16, figs. 9 to 13. 



Shell perforate, dextral, oblong-ovate, solid, obsoletely 

 granulose-striate, rather shining; fulvous, marked with close 

 darker lines. Spire conic, rather acute, suture light, white- 

 edged. Whorls 5, nearly flat, the last longer than the spire. 

 Aperture oblong, narrow, whitish within, provided with a 

 small callous [parietal] tooth deep on the ventral side of the 

 penult whorl. Peristome somewhat thickened, strongly 

 white-lipped within, the margins parallel, right margin nar- 

 rowly expanded, somewhat toothed in the middle, columellar 

 margin dilated, flat, reflexed. Length 23, diam. 11, aperture 

 13 x 8 mm. Type in Mus. Cuming. (Pfr.) . 



Lower portion of Vaioara valley, on the west coast of 

 Raiatea and spread along the lowland forests south as far as 

 Uparu valley; very abundant, associated with P. fusca; usu- 

 ally lurking beneath decaying vegetation, but sometimes taken 

 on the trunks of trees. (Garrett). 



Bulimus navigatorius PFR., P. Z. S., 1849, p. 131. Par- 

 tula navigatoria PFR., Monogr. iii, 449. REEVE, Conch. Icon. 

 vi, 1850, pi. 4, f . 21. GARRETT, Journ. A. N. S. P. ix, p. 76. 

 Partula variabilis PEASE, Amer. Journ. of Conch, ii, 1866, 

 p. 203; iii, 1867, p. 8, pi. 1, f. 12-14; P. Z. S. 1871, p. 473. 

 PFR., Monogr. viii, 201. 



This form differs from P. faba chiefly by having the last 

 two whorls less convex than usual in that species, and the 

 aperture is narrower, more contracted. Moreover it lives. for 

 the most part on the ground, and has its own patterns of 

 coloring, which however do not differ much from the patterns 



