62 
terrestrial mollusca inhabiting society islands. 
So far as the description goes, it coincides with tlie pale, banded, edentate Moorea 
shells. 
Reeve describes it as follows : — 
“ Shell acuminately oblong, umbilicated, rather thin, whorls six in number, spirally 
very finely striated, light fulvous, subtransparent, encircled with two distant chestnut 
])ands. Lesson, Voyage de la Coquille, p. 324, Plate \ II, figs. 8, 9. Hah. biiendh 
Islands ” (Reeve). 
Like I.esson, he does not mention the parietal tooth, which is well-expressed in 
his figure. Ilis description is from examples in the Cumingiau collection, and is 
certainly the Moorea shell. His habitat, “ Friendly Islands” = Tonga, is incorrect. 
Only one species (P. suhgonoc7ieila) inhabits that grouji. 
Pfeiffer, in his “ Monographia Heliceorum,” vol. iii, gives a more detailed descrip- 
tion of Uneata, also from .specimens in Cuming’s collection, and cites “Oualan et 
Eimeo ” (= Moorea) as location, but in his subsequent volumes omits the latter loca- 
tion. Like the two former authors, he does not allude to the parietal tooth. 
However, he makes tlie same omis.sion in two other dentated species. 
A candid comparison of Pfeiffer’s descriptions of P. sfenostoma and lineata has 
convinced me that they cannot refer to the .same species. I’hc latter uudoubtc'dly is 
tlie Moorea shell. Tlie former, according to the measurements, refers to a larger and 
more robust shell, being, in fact, the same size and proportion as J\ planilahnim. In 
Pfeiffer’s original diagnosis he .says “ hete ca.staneo bilineata,” and, in his Monograph, 
“ lacte castaneo trilineata.” 
'I'he Oahumi shell which was described by Pfeiffer under the name of strigasa. 
i.s, by some authors, afiiliated with P. nodosa, an entirely different species, inhabiting 
a limited area in Tahiti. Mr. Gloync and Dr. Hartman first pointed out its very 
close relationship with /-*. vexUlam = Uneata. Indeed, the inosculation is so complete- 
that the} must be considered one and tlie same species. 
Ihc Oalnimi shells me usually a tiifie smaller, not so frequently dentate.!, and are 
mud, n.ore conspicuously strigated than the Vaiauai shells. The spiral la.nds, of 
which there are one or two, seldom throe, on the body.whorl, are very lrc,,„eutly 
ntarupted, which, with the conspicuous strigations, gives the shell a somewhat tessel- 
lated appeamiue. All the eolor-varieties alluded to in inv remarks on the Vah.nai 
diclls are also loun.l in Oahumi, hut the uniform dark-colored ones are more frequent 
tris i:::f ^ took three e-Z^::.' 
He gives the .ZiZ;' MZaZ ts ZZ 
describes found in the western Picifie T. • ’ Zl' 'll’® 
anil I fully agree with Dr Hartman ' • f » Society Islands species, 
The .lescription is sufflcientlv near to iusKfvZ ‘d Z” 
.1 ■ the identification. Rut I cannot share 
