TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 69 
Vaianai, is the limit of the range of the latter species on that part of the island, and 
hybrids between it and e/ongata are rather common, the same as between (Garvrettii 
and Thalia at Raiatea. To the eastward of Vaianai it ranges throughout the small 
valleys for a distance of several miles, as far as Ohaumi, the specific centre of 
strigosa. 
I cannot agree with Dr. Hartman in uniting this species with feeniata. It is only 
through hybrids between the two species that the inosculation takes place. Examples 
taken in any of the valleys not inhabited by tewniu/a prove at once its distinction. 
The type is elongated, thin, translucent, corneous, straw-yellow or pale fulvous, 
frequently 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 less broken, revolving bands are not infrequent. They vary in the length of 
the spire, as the following measurements will show :— 
Length 17, diam. 7§ mill. 
Length 15, diam. 8 mull. 
P. THawis, Garrett. Plate III, fig. 46. 
Partula abbreviata, Pease, MS. (not of Mousson) Coll. Pease, 1863. 
Partula auriculata, var., Carpenter, Proc. Zool. Soc., 1864, p, 675. 
Partula Peaseana, Garrett, MS. (not Peasei, Cox). 
Partula Thalia, Garrett, MS. (Nenia) Hartman, Cat. Part., p. 7; Obs. Gen. Part., Bul. 
Mus. Com. Zool., ix, pp. 188, 191, 192. 
Shell compressly perforated, solid, ovate-conic, somewhat shining, lines of growth 
rather smooth, and revolving incised lines very fine and crowded; whitish or yellowish 
horn-color, with or without a purple-black apex; spire rather short, conical, with 
plano-convex outlines, half the length of the shell; suture slightly impressed ; 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 within, sinuous above, and the margins frequently joined by a ridge of callus. 
Length 17, diam, 11 mill. 
Var. a. Fulvous brown, with or without purple-black apex. Rather rare. 
Var. 6. With brown base and sutural band. Not common. 
The specific centre of this very abundant arboreal species is in Huaru valley, on 
the west coast of Raiatea. 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. Garrettii. 
It is smaller, smoother, more shining, much less variable in color, and the aperture 
is less auriform than P. auriculata. 
The columella is frequently slightly gibbous or nodulous in the inner margin. 
10 JOUR. A. N. 8S. PHILA., VOL. IX. 
