232 PARTULA, RAIATEA AND TAHAA. 



more strongly tuberculate columella, and usually no parietal 

 tooth. P. thalia seems to 'be a quite distinct species. I have 

 seen a large number besides Garrett 's type lot (figs. 10, 11), 

 mostly labeled "P. abbreviata Pse.," a preoccupied name. 



Group of P. fab a. 

 33. P. RADIATA 'Pease' Garrett. PL 18, figs. 5, 6, 7. 



"Shell rimately perforated, moderately thick, not shining, 

 surface roughened by unusually coarse, rude incremental 

 striae, 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 coni- 

 cal, with planulate outlines, half the length of the shell ; apex 

 subacute, concolored, white, or light brown; suture linearly 

 impressed, sometimes whitish ; whorls 5-5%, flatly convex, last 

 one large, convex, sometimes obsoletely angulated in front 

 and generally a little compressed behind the outer lip. Aper- 

 ture subvertical, oblong, obauriform, sides parallel; parietal 

 region more or less glazed, and, with few exceptions, fur- 

 nished with a white tubercular tooth; peristome whitish, fre- 

 quently margined with pale purplish brown, rather thin, con- 

 siderably 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 sub- 

 nodose. Length 21, major diam. 10 mm." (Garrett). 



"Var. a. Uniform chestnut-brown. Frequent. 



"Var. b. With a chestnut-brown base and sutural band. 

 Not uncommon. 



"Var. c. With a median brown or chestnut-brown band. 

 Somewhat rare. ' ' ( Garrett ) . 



Raiatea: "The metropolis of this species is in Hamoa val- 

 ley, 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." 

 (Garrett). 



