PARTULA CLARA. 69 
banded snails (figs. ro and 11, plate 21) bore 3 banded offspring, but the embryos of 
the other examples were too immature to exhibit their definitive colors or patterns. 
The striped snails are peculiar in the distinctness of their major band and in 
the clearer development of the sutural band. In one of them an intermediate 
band appears, although this is far weaker than in the Opiriroa shells. Statistically, 
these two shells stand near the median values of their unbanded associates. 
Taharua V alley.—Only 2 adult snails were secured in this large and deep valley, 
a fact that is noteworthy in connection with the relatively large collection from 
Teohu. One of these is an ordinary light shell, but the other is banded in a peculiar 
way (fig. 12, plate 21); it is like a Teohu shell in which the median band is broad 
and almost fused with the major band. In a way it is transitional to the striped 
shells of Faarahi beyond. 
Moaroa Valley —The Moaroa shells are described statistically (table 25) only 
to illustrate the variation in colonial characteristics. All of the 27 shells are 
unbanded, and present no peculiar features. 
Faarahi Valley.—Here 10 specimens were secured, 7 light, 1 dark, and 2 banded 
(figs. 13 and 14, plate 21). Each kind breeds true to its color type: 12 light young 
from 6 light parents, 2 dark young from the single dark specimen, and 3 striped 
young from the 2 banded individuals. 
A statistical comparison of the two aberrant snails with the whole group (which 
of course includes these) shows (table 25) some deviation on the part of the banded 
specimens, but on the whole they agree with the others of their locality. This 
result is similar to that established in the case of incrassa, from Aoua Valley. It 
supports the conclusion that banded specimens arise from unbanded forms in various 
places and that the former do not constitute a distinct widely distributed stock. 
We shall return to this subject in the summary, after adducing additional facts. 
V araharaha V alley.—In this great valley, as well as in its close neighbor, Vaihiria, 
relative large numbers of clara were taken. ‘The figures are 95 and 92, respectively, 
and the corresponding population percentages are 27.77 and 23.23. Yet the col- 
lections of clara are strikingly different, in spite of the fact that these two large 
valley areas are confluent at their mouths (plate 17)). All of the Vairaharaha shells 
were taken on the west border of the stream, while the Vaihiria collections were made 
mainly on the east side of the Vaihiria River. Of the shells from Vaiaharaha, 94 are 
dark brown, with purple-brown apices and purplish suffusion on the lip (figs. 15 and 
16, plate 21). The last-mentioned character is not found to the west and north, and 
the second also is very rarely displayed in regions previously discussed. The single 
remaining shell is a typical light example, similar to a more abundant series from 
Vaihiria. The statistical description (table 25) refers to the 94 dark shells. The 
most notable features are the stoutness of the shell and the relative breadth of the 
aperture. ‘The single light shell is a large example, agreeing with many belonging 
to the dark series. Data relating to the heredity of color characters were provided 
by 33 specimens whose 48 young belonged to the parental color-class. The color 
of these embryonic shells is not so deep as that of the full-grown or of the adolescent 
