68 TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
Var. £ Yellowish, with the sutural line tinted with rose or purple-brown. Very 
common in Faahiti valley, but rare elsewhere. == P. cognata, 
Var. g. Yellowish, with the spire more or less rose or purple-brown. Common. 
They vary in a greater or less degree in the proportion of length to diameter, as 
well as in the thickness of the shell; and some are more distinctly angulated than 
others. 
P. pEeNnTIFERA, Pfeiffer. Plate ITI, fig. 84. 
Partula dentifera, Pfeiffer, Proc. Zool. Soc., 1852, p. 85; Mon. Hel., iii, p. 447. Carpenter, 
Proc. Zool. Soc., 1864, p. 675 (part). Pease, Proc. Zool. Soc., 1871, p. 473. Schmeltz, 
Cat. Mus. Godeff., v, p. 207. (Astrea) Hartman, Cat. Part., p. 8, with woodcut; Obs. 
Gen. Part., Bul. Mus. Com. Zool., ix, pp. 181, 188, 194 (excl. Raiatensis). 
Partula decorticata, Pease, MS. Coll. Pease, 1863. 
Partula labiata, Pease, MS. Coll. Pease, 1863. Paetal, Cat Conch., p. 104. Schmeltz, Cat. 
Mus. Godeff., v, pp. 92, 207. Pfeiffer, Mon. Hel., viii, p. 209. 
The specific centre of the type of this species is in the large valley of Vairahi, on 
the east coast of Raiatea, where it occurs in vast numbers on foliage in company with 
the typical P Hebe. It has not spread at all to the southward, but, on the other hand, 
has migrated into a small adjacent valley, where it is much less abundant, and differs 
from the type in about half of the specimens having a prominent parietal tooth, which 
is always absent in examples inhabiting Vairahi; otherwise the shells are not dis- 
similar. 
It may be distinguished by its elongate-conical form, straw-yellow color, rather 
shining surface, chink-like perforation, and small oblong obauriform white aperture. 
The peristome is ivory-white, heavily calloused, the surface angularly ridged, strongly 
labiated within and armed with a median prominent acute denticle, above which 
the lip is strongly contracted, forming a conspicuous sinus. A very rare variety occurs 
of a ruddy brown color, purple-black apex, and flesh-colored peristome. Examples 
with a white sutural line are not infrequent; otherwise it is mever ornamented with 
bands. ‘The most perfect specimens always have the body-whorl more or less decorti- 
cated behind the peristome, which suggested the provisional name decorticata. 
P. ELONGATA, Pease. 
Partula elongata, Pease, Amer. Jour. Conch., 1866, p. 196; 1867, p. 81, Pl. I, fig. 2; Proce. 
Zool. Soe., 1871, p. 473. Schmeltz, Cat. Mus. Godeff., iv, p. 72. Pfeiffer, Mon. Hel., viii, 
p- 196. 
Partula lineata, Carpenter (not of Lesson), Proc. Zool. Soc., 1864, p. 676. 
Partula teniata, Hartman (not of Mirch), Obs. Gen. Part., Bul. Mus. Com. Zool., ix, p. 
188 (part). 
The headquarters of this arboreal species is in Vaianai valley on the southeast coast 
of Moorea, where it is abundant, associated with P. lineata and P. Mooreana. It 
occurs, also, but in less numbers, in a valley to the westward, where it is found in 
company with lineata and teniata. The same valley, which is about two miles from 
a 
