n TKIUIESTIUAL MOLLUSCA INHAEITINO SOCIETY ISLANDS. 
.omotimAs l,r,nvn-bla.k, and frequently atrigated. Yellowiah horn-colored examples 
with the hase and the sutural band chestnut, are not uncommon. Ihe lip, though 
usually white, is frequently margined with purple-brown. 
Length 20, diam. 1 1 mill. . 
'I'he above is about the average dimensions. My largest example is ^4 by 13^ 
and the smallest adult 1 7 by 10 mill. Sometimes, though rarely, the spire equals half 
the length of the shell. Very old examples have a more or less nodulous columella 
and a more or less distinct denticle on the outer lip. 
P. TiENIATA, Miirch. 
Bulimus (Partidus) tseniatus, Mfircb, Cat. Conch. Kjerulf., p. 29. 
Bulimus Otaheitanus, var., Pfeitfer, Mon. Hel., ii, p. 72, part. 
Partula tseniata, Pfeiffer, Mon. Hel., iii, p. 451. Carpenter, Proc. Zool. Soc., 1864, p. 675. 
Hartman, Obs. Gen. Part. Bub, Mus. Com. Zoob, ix, p. 188 (part). 
Partula utriolata, Pease, Amer. Jour. Coneb., 1866, p. 197 ; 1867, p. 81, Pb I, fig. 4 ; Proc. 
Zoob Soc., 1871, p. 473. Pfeiffer, Mon. Heb, viii, p. 203. 
Partula Himulans, Pease, Amer. Jour. Coneb., 1866, p. 202; 1867, p. 81, Pb I, fig. 11. Paetel, 
Cat. Conch., p. 104. Scbmeltz, Cat. Mus. Godeff., v, p. 92. Pfeiffer, Mon. Heb, viii, 
p. 206. 
Partula nucleola, Pease, MS. Coll. Pease, 1863. 
Partula decussatula, Carpenter (not of Pfeiffer), Proc. Zoob Soc., 1864, p. 675. 
Partula fpadicea, Hartman (Reeve ?), Cat. Part., p. 11. 
The metropolis of this truly protean species is in a very large semicircular valley 
on the north coast of Moorca, where it occurs in prodigious numbers on the foliage 
of bu.shes. In the western part of the same valley, where it exhibits less variation, 
it gradually intergrades with the form which has been distributed under the name 
of nucleoid. Pease, which has its headquarters in a small, but isolated, valley about two 
miles west of Opunohu. 
Pease s mtcleoln, which is quite abundant, is usually smaller, more solid, spire 
shorter, aperture smaller and more rounded, and the columella is more distorted, than 
in the t}])ical twmala. But in looking over a large number of specimens we notice 
some examples which cannot be separated from some of the smaller forms of the 
latter species. 
On the southwest part of the island we find iceniata tolerably abundant in three 
valleys, and, like the shells in the western part of Opunohu, it is subject to much less 
variation than obtains in the eastern part of the same valley. The shells from the 
southwest coast were described by Pease under the name of P. simulans. 
In the third or more eastern valley, where they come in contact w ith P. elongata 
and hneatn, hybrids between the former and tceniata are so numerous that anv one 
collecting m that valley only would, without hesitation, pronounce them one and the 
same species. 
from tins point to a distance of several miles, the valleys are inhabited by lineata. 
