ilrrestrial mollusca inhabiting society islands. G9 
1 species on that part of the island, and 
7 ^ e^ongrato are rather common, the same as between Garrettii 
an mm. at Kaiatea. To the eastward of Vaianai it ranges throughout the small 
y oi a distance of several miles, as far as Ohanmi, the specific centre of 
stngosa. 
I cannot agree with Dr. Hartman in uniting this species with ia>niut<i. It is only 
tlirough hybrids between the two species that the inosculation takes place. Examples 
ta 'en in any of the valleys not inhabited by tainiaia prove at once its distinction. 
1 he type is elongated, thin, translucent, corneous, straw-yellow or pale fulvous, 
fiequently with narrow longitudinal darker stripes, and the rather ample aperture is 
edentated. The outer lip is thin, simple, moderately expanded. The columella is flat, 
not nodulous or gibbous. Examples with two to four narrow, light chestnut-brown, 
more or le.ss broken, revolving bands are not infrequent. They vary in the length of 
the spire, as the following measurements will show : — 
I.ength 17, diam. mill. 
Length 1.5, diam. 8 mill. 
B. Thalia, Garrett. Plate III, fig. 46. 
Partula abhreviata, Pease, MS. (not of Mousson) Coll. Pease, 1863. 
Partula auriculala, var., Carpenter, Proc. Zool. Soc., 1864, p. 675. 
Partula Peaxeana. Garrett, MS. (not Peasei, Cox). 
Partula Thalia, Garrett, MS. (Nenia) Hartman, Cat. Part., p. 7; Obs. Gen. Part., Bui. 
^Iiis. Com. Zool., ix, pp. 188, 191, 192. 
Shell coinpressly jierforated, solid, ovate-conic, somewhat shining, lines of growth 
rather smooth, and revolving incised lines very fine and crowded; Avhiti.sh or ynllowish 
liorn-color, with or without a purple-black apex; spire rather short, conical, with 
])lano-convex outlines, half the length of the shell; suture slightly imprcs.sod; whorls 
five, flatly convex, the last one large, subglobose ; aperture subvertical, abbreviately 
subauriform ; parietal region more or less glazed, and armed with a white tubercular 
tooth ; peristome white, moderately^ expanded, thick, angularly ridged, strongly incras- 
■sated witliin, sinuous above, and the margins frequently joined by a ridge of callus. 
Length 17, diam. 11 mill. 
^’ar. a. Fulvous brown, with or without purple-black apex. Eather rare. 
Var. h. With brown base and sutural band. Not common. 
The specific centre of this very abundant arboreal species is in Huarn valley, on 
tlie west coast of Kaiatea. It has spread along the well- wooded lowlands about two 
miles north and one mile south of its metropolis, slightly overlapping the northern 
range of P. GnrreltH. . , , . , j ♦ 
It is s, nailer, smoother, more shining, much less variable m color, and the aperture 
is les.s auriform than P. (Utriciilota. ... 
The columella is fre,|nently slightly gibbous or nodulous in the inner margin. 
10 JOUR. A. N. 8. PHILA., VOL. IX. 
