74 TERRESTRIAL MOLLUSCA INHABITING SOCIETY ISLANDS. 
Islands. Judging from the description and figure of spadicea, I am inclined to consider 
it distinct and an inhabitant of the latter group of islands. 
P. RADIATA, Pease, MS. Plate III, fig. 45. 
Partula radiata, Pease, MS. Coll. Pease, 1863. Hartman, Cat. Part., p. 7; Obs. Gen. Part., 
Bul. Mus. Com. Zool., ix, p. 185 (part). 
Partula compressa, Carpenter (not of Pfeiffer), Proc. Zool. Soc., 1864, p. 675. Pease, Proc. 
Zool. Soc., 1871, p. 473. Schmeltz, Cat. Mus. Godeff., v, p. 207. 
Partula microstoma, Pease, MS. Coll. Pease, 1863. 
Partula vittata, Hartman (not of Pease), Cat. Part., p. 7 (part). 
Shell rimately perforated, moderately thick, not shining, surface roughened by 
unusually coarse, rude incremental striee, and the spire marked by more or less distinct 
crowded spiral incised lines; color whitish or pale luteous horn-color, with longitudinal, 
irregular, narrow darker stripes; spire conical, with planulate outlines, half the length 
of the shell; apex subacute, concolored, white, or light brown; suture linearly impressed, 
sometimes whitish; whorls 5-54, flatly convex, last one large, convex, sometimes 
obsoletely angulated in front and generally a little compressed behind the outer lip; 
aperture subvertical, oblong, obauriform, sides parallel; parietal region more or less 
glazed, and, w ith few exceptions, furnished with a white tubercular tooth; peristome 
whitish, frequently margined with pale purplish brown, rather thin, considerably 
expanded, concave, very obliquely slanting, strongly and acutely labiated on the inner 
margin, which is more or less distinctly toothed and sinuous above; columellar lip 
subnodose. 
Length 21, major diam. 10 mill. 
Var. a. Uniform chestnut-brown. Frequent. 
Var. 6. With a chestnut-brown base and sutural band. Not uncommon. 
Var. c. With a median brown or chestnut-brown band. Somewhat rare. 
The metropolis of this species is in Hamoa valley, on the east coast of Raiatea, the 
home of callifera and compacta. It is quite common beneath decaying vegetation and 
among piles of loose stones. It has not spread any to the northward, but occurs in 
limited numbers in all the valleys south as far as Vairahi, the headquarters of P. 
dentifera. 
P. microstoma, which inhabits the latter valley, though very frequently found 
adhering to the lower portion of the trunks of trees and shrubs, can scarcely be 
separated from radiata, which is strictly terrestrial in habit. Dy. Hartman unites it 
with P. vittata. It appears to me more nearly related to radiata than the latter, which 
is smoother, and the columellar lip is flat and simple. 
The Hamoa shell, which has been widely distributed under the name of compressa, 
is considered by Dr. Hartman to be entirely distinct from the latter, and I follow him 
in restoring Pease’s original name. Hybrids between these shells and P. faba are not 
infrequent. 
