160 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
The statistics of fecundity (table 100) show a high rate of productivity; the 
season of collection was the drier period of July and August, when also the 1908 and 
1909 collection from Papenoo were obtained. 
TaBLe 100.—Partula otaheitana rubescens, Faarumai, Tiarei, and Mahaena Valleys. 
Fecunpity. 
No. of} Per cent | No. of} No. of} Total | Per cent } Per cent 
Records. 
gravid.| gravid. | eggs. |young./contents.| for all. |for gravid. 
Faarumai..... 9 8 88.8 18 20 38 4.2 4.7 
PAT elses ache 15 15 100 25 23 48 So 37) 
Mahaena........ 6 6 100 9 9 18 3.0 3.0 
Herepity, FAARUMAI. Herepity, TIAREI. 
Young, | Young, Young, | Young, Total. 
yellow. red. yellow. red. 
Yellow, adults. 9 0 9 Yellow, adults .. 10 5 15 
Red, adults.... 7 4 11 Red, adults..... 4 4 8 
Rotalee trace 16 4 20 PROtall\cractee renee 14 9 23 
The figures of heredity possess some interest (table 100). In Faarumai the 
same excess of yellow young discovered in Papenoo recurs. In Tiarei a stable 
condition of the colony is indicated. The red individuals of Mahaena produced 
nine young of their own kind. 
PARAURA VALLEY. 
In this locality rubescens is represented by 89 adults, which constitute 13.3 per 
cent of the otaheitana population. ‘They are very beautiful in color (plate 27, figs. 
20 to 26), and display well-marked subordinate types of coloration in both of the 
primary classes called yellow and red; the darker tinge of the upper coils spreads 
down the spire in more than 80 per cent of the light shells (fig. 22), and in about 60 
per cent of the red shells (fig. 25). Where decortication occurs, it affects the body 
whorl especially, so that the contrast of the deeper whorl spire is heightened (fig. 26). 
In statistical characters (table 101) the colony as a whole comprises shells that, 
as compared with those of Mahaena, are slightly longer, far narrower, and greatly 
lessened in the proportion of the whole shell. The aperture is much larger on the 
whole, somewhat narrower in proportions, and decidedly stouter in relation to 
shell length. The tooth is developed to some degree in 65 per cent of the shells. 
When the yellow and red classes are compared (table 101) they show marked 
differences that are especially noteworthy in the proportions of the whole shell and 
in the relation of aperture length to shell length. The aperture of the lighter shells 
is distinctly larger in both absolute dimensions. 
The fecundity of this colony (table 102) was high at the time of collection, as 
regards the proportion of gravid individuals, but the average number contained in 
the brood-chamber was not large. 
