PARTULA OTAHEITANA. 131 
valleys were filosa, attenuata, and hyalina. * * * Inthe next valley, called Haona, I found 
the dextral affinis abundant, and took a few of amabilis. * * * Both Dr. Pfeiffer and 
Dr. Reeve described the latter species from specimens in the Cumingian collection, and 
both quote Anaa, a low coral island, as its habitat. Having resided about five months on 
that island, and searched all parts for shells, I did not find a single Partula there, or on 
any low coral island. Though neither Pfeiffer nor Reeve allude to a parietal tooth, it is 
frequently present.” 
Everything in this statement is of fundamental importance. Apparently 
Garrett passed by the smaller gullies in the sector between F'autaua and Papenoo, 
such as Pohaitara and Ururoa, from the upper parts of which I secured snails, 
although the lower parts are barren of these animals. Haona Valley could not be 
identified by that name, either on the basis of the territorial records or through 
consultation with the native chiefs. By Haona, Garrett possibly meant Ahonu, of 
which the last letter is easily mistaken for an a, while a transposition of the first 
two letters of a name is by no means uncommon; yet the snails of Ahonu scarcely 
agree with Garrett’s description, even allowing for drastic changes since his time. 
When Garrett says that the only dextral specimens in the two valleys— 
Hamuta and Pirai—were filosa, attenuata, and hyalina, it is possible that he was 
guilty of a /apsus calami, thinking only of Pirai, where such is the case; but either 
he erred regarding the population of Hamuta or an astonishing change has taken 
place since his day. In my own collections and in Mayer’s the dextral individuals 
of amabilis number fully one-third of the whole representative population. 
One further general point is that Garrett correctly notes the presence of 
narrowly-banded snails somewhat similar to /ignaria, a primary variety of Tipaerui 
Valley, to the west of Fautaua. He speaks of immature examples only, while 
Mayer and I have secured adults and embryonic young as well. These individuals 
are not really related to /ignaria, as the future account will show; the essential 
point is that they are entirely distinct from sinisirorsa, which Pfeiffer confused 
with amabilis. 
The census table for the whole island (table 9) and the more specific table 56, 
referring to P. otaheitana, give the absolute and relative numbers of amabilis in the 
valleys of its range. We may now pass to the detailed description of this primary 
variety as it exists in varying forms throughout its territory. 
HAMUTA VALLEY. 
This valley is close to Fautaua, from which it is separated by only one flat- 
topped ridge (plates 5a, 9,10, and 11). It bends sharply to the east and then to the 
west, trending toward the eastern branch of Fautaua, and grades rapidly upwards 
as it is followed inland. Finally it is lost high up on the divide between the middle 
portions of Pirai and Fautaua Valleys. Drier and less wooded ridges seem to be 
effectual barriers to the snails inhabiting the upper portions of Hamuta and its 
neighbors, although the possibility of actual migrations from one to another during 
long-continued periods of rain can not be absolutely eliminated. 
The collections of the present research were obtained from substantially the 
same part of this valley in 1906, 1907, and 1909; as in Fautaua, therefore, the 
