TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 63 
coast of Tahaa, where it occurs in abundance on the trunks of a species of wild 
banana and at the roots of ferns. Mr. Pease cites “Tahiti” as the habitat of this 
species, which is an error. 
It is readily distinguished by its smooth, glossy surface, ovate-conic form, yellowish 
horn-color, and two revolving chestnut-brown bands, the upper one narrow and 
subsutural. The subacute apex is sometimes purple-brown and the suture is margined 
by a narrow, rugose, whitish line. The constant parietal tooth is prominent and the 
broad white peristome is slightly emarginate above, strongly labiate within, and widely 
expanded, 
Var. a. With a single broad median chestnut-brown band. Not common. 
Var. 6. Chestnut-brown with a yellowish horn-colored sutural band. Very rare. 
Var. c. Uniform yellowish horn-color, Very rare, 
They are all remarkably uniform in shape and size. 
As compared with P. auriculata, with which it has been confused, it is more 
glossy, smoother, the lip broader, the umbilicus more open and the fasciation different. 
It is more nearly connected with P. planilabrum and virgined. 
P. PLANILABRUM, Pease. Plate III, fig. 77. 
Partula suturalis, Pease, MS. (not of Pfeiffer). 
Partula planilabrum, Pease, Proc. Zool. Soc., 1864, p- 672; 1871, p. 473. Pfeiffer, Mon. 
Hel., vi, p. 156. Binney, Proc. Acad. Nat. Sci. Phil., 1865, pp. 245, 247. Schmeltz, Cat. 
Mus. Godeff., vi, p. 81. Hartman, Cat. Part., p.7; Obs. Gen. Part., Bul. Mus. Com. 
Zool., ix, pp. 185, 188, 190. 
The metropolis of this species is Haamene valley, on the east coast of Tahaa, 
where it is common, and, though usually lurking beneath decaying vegetation, is 
sometimes found adhering to the trunks of the wild banana. It is found, though 
less abundant, in a valley north of its specific centre, but does not occur in the inter- 
mediate valley Faa-apa, the home of bilineata. 
It is larger and more elongated than the latter species, and the surfaee is not so 
smooth and shining. ‘The structure of the peristome is similar in the two shells, but 
the aperture is more elongate. The parietal tooth is constant in adults. 
The type is deep chestnut-brown, gradually fading into yellowish corneous towards 
the sutural line, and the whitish lip is frequently tinged with violet. 
Var. a. Fulvous yellow, with the basal half of the body-whorl, and a revolving 
subsutural band, deep chestnut-brown. Not infrequent. 
Var. 6. Uniform pale corneous or light fulvous. Rare. 
Like the preceding species it is very uniform in all its specific characters. ‘The 
fasciation of variety a resembles the typical markings of bilineata. 
