TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 49 
forms of Otaheitana, occurs in greater or less abundance in all the valleys from Haona 
as far as the southeast end of Taiarapu peninsula, and round the opposite coast as far 
as Papieri on the southwest of Tahiti proper. In Papinoo I discovered a large colony 
of affinis, many of which had the pinky flesh-colored lip and sinistral form of Otahei- 
tana. Far up in the same valley, though common, none but dextral forms were found, 
and out of thousands taken in the other valleys, not one sinistral example occurred to 
my notice. In a valley several miles from Papinoo I found a small colony of «finis, 
which were marked by three transverse reddish chestnut bands like lignaria. And 
most singular, no other banded specimens of afjinis occurred to my notice in any other 
part of the island. It is the variety dbia, Pse., and by Carpenter erroneously referred 
to varia. 
Reeve’s rubescens = turricula, Pse., MS., is abundant in Papinoo, and occurs 
sparingly in all the valleys as far as the southeast end of the island. Like amubilis 
it cannot be separated from the sinistral turreted Otaheitana, inhabiting Fautana, It 
is always sinistral, never banded, and, though usually of a reddish tint, is frequently 
straw-yellow or fulvous, with or without a reddish or pinky apex. The lip is white or 
pinky flesh-color. Though described as edentate, some have a small parietal tooth. 
Reeve gave no locality, and Pfeiffer erroneously cites the Marquesas as its habitat. 
Pease’s sinistrorsa is confined to the south coast of Tahiti proper, where it exists 
im the greatest profusion in all the valleys and lowland forests for a distance of ten or 
twelve miles. In the valley which is the limit of the range of the dextral afinis I 
took several specimens of the sinistral sinistrorsa. The latter is invariably reversed, 
dentate or edentate, fulvous with three more or less diffused reddish chestnut bands. 
Reeve figures the same shell on Plate IIT, fig. 13, as Otaheitana. Bandless varieties 
are frequent, and vary from straw-yellow to fulvous or light chestnut, frequently strigated 
and the lip white. The latter varieties differ none from the true Otaheituna of 
Fautana. 
{t is worthy of remark that in that part of the district of Papieri, occupied by 
stuistrorsa, is also the headquarters of the terrestrial P. producta, a dextral species, 
which is always edentate, and exhibits the fasciation of the former. 
After passing to the westward of the range of the typical sinistrorsa, which 
presents the same features for a distance of ten or twelve miles, it suddenly exhibits a 
tendency to a change in its becoming more stunted, more solid, always dentated, and 
the bands, one to three, are sharply defined on a pale ground. It is the sinistralis of 
Pease, MS., and occupies two valleys. 
In the next large valley, called Faahuaite, on the southwest coast, we find Pease’s 
erassa (MS.), which is also a sinistral shell, always dentated, solid, more tightly coiled 
than sinistrorsa, and the body-whorl is more flattened. It is rarely marked by a single 
narrow submedian chestnut band. In the same valley, but more inland, occurs a 
smaller form, which is, I suppose, the P. brevicula, Pse., MS. 

