52 TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
So far as the description goes, it coincides with the 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 
bands. Lesson, Voyage de la Coquille, p. 324, Plate VII, figs. 8.9. Hab.—Friendly 
Islands ” (Reeve). 
Like Lesson, he does not mention the parietal tooth, which is well-expressed in 
his figure. His description is from examples in the Cumingian collection, and is 
certainly the Moorea shell. His habitat, “ Friendly Islands” — Tonga, ¢s incorrect. 
Only one species (P. subgonocheila) inhabits that group. 
Pfeiffer, in his “ Monographia Heliceorum,” vol. iii, gives a more detailed descrip- 
tion of /ineata, 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 the same omission in two other dentated species. 
A careful comparison of Pfeiffer’s descriptions of P. stenostoma and lineata has 
convinced me that they cannot refer to the same species. The latter undoubtedly is 
the Moorea shell. ‘The former, according to the measurements, refers to a larger and 
more robust shell, being, in fact, the same size and proportion as P. planilabrum. In 
Pfeiffer’s original diagnosis he says “ leete castaneo bilineata,” and, in his Monograph, 
“]leete castaneo trilineata.” 
The Oahumi shell which was described by Pfeiffer under the name of strigosa, 
is, by some authors, affiliated with P. nodosa, an entirely different species, inhabiting 
a limited area in ‘Tahiti. Mr. Gloyne and Dr. Hartman first pomted out its very 
close relationship with P. vexillum = lineata. Indeed, the inosculation is so complete 
that they must be considered one and the same species. 
The Oahumi shells are usually a trifle smaller, not so frequently dentated, and are 
much more conspicuously strigated than the Vaianai shells. ‘The spiral bands, of 
which there are one or two, seldom three, on the body-whorl, are very frequently 
interrupted, which, with the conspicuous strigations, gives the shell a somewhat tessel- 
lated appearance. All the color-varieties alluded to in my remarks on the Vaianai 
shells are also found in Oahumi, but the uniform dark-colored ones are more frequent, 
besides one of a uniform white color, not decorticated, of which I took three examples. 
So far as | can ascertain, there has been no figure published of Pfeifter’s strigosu. 
He gives the Admiralty Islands as its habitat. There are no species of the type he 
describes found in the western Pacific. It is undoubtedly a Society Islands species, 
and I fully agree with Dr. Hartman in referring it to the shells under consideration. 
The description is sufficiently near to justify the identification. But I cannot share 
