TERKKSTIUAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
()8 
^'ar./. Yellowish, with the sutural line tinted with rose or pui'ide-brown. Very 
coininon in Faahiti valley, but rare elsewhere. = P. cognota. 
A'ar. g. Yellowish, with the spire more or less rose or purple-brown. Common. 
'I'hey 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. DENTiFERA, Pfeiffer. Plate III, 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, Proe. Zool. Soc., 1871, p. 473. Schmeltz, 
Cat. Mils. Godeff., V, p. 207. {Astraea) Hartman, Cat. Part., p. 8, with woodcut; Obs. 
Gen. Part., Bui. Mus. Com. Zool., ix, pp. 181, 183, 194 (excl. Baiatensis). 
Partula decorticata, Pease, MS. Coll. Pease, 1863. 
Partula labiata, Pease, MS. Coll. Pease, 1863. Paetal, Cat Concli., 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 cast coast of Raiatea, rvhere 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 otlier hand, 
has migrated into a small adjacent valley, where it is much less abundant, and differs 
from tlic type in about half of the specimens having a prominent parietal tooth, which 
is ahoags 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. 
Tlie peristome is ivory-white, heavily calloused, the surface angularly ridged, strongly 
labiated within and armed with a median prominent acute denticle, above which 
the hp 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 
uith a white sutural line aie not infrequent; otherwise it is never ornamented with 
bands The most pmfect specimens always have the body-whorl more or less decorti- 
cated behind the peristome, which suggested the provisional name decorticata. 
P. ELO.NOATA, Pe.ise. 
Partula elongata, Pease, Amer. Jour. Conch., 1866, p. 196 • 1867 
Zool. Soc., 1871, p. 473. Schmeltz, Cat. Mus. Godeff., iv’ p. 72.’ 
p. 81, PI. I, fig. 2 ; Proc. 
Pfeiffer, Mon. Hel., viii, 
Kn,ala, C.rpcrter „f Le.son), Zool, Soc., 1804. p. 076. 
Tsl lTt) " «"»• 2»<»- P- 
occ .r “<: bu „ I “’’“‘'•“‘■.••-“-‘Od witl. c n„eaia and P. Mooreana. It 
con.p„;/:i.;:i:.:Tnd;:„ts .he_d,whete a i, fo„„d i„ 
«• The same valley, which is about two miles from 
