PARTULA OTAHEITANA. 137 
TaBLe 71.—Partula otaheitana amabilis, Hamuta Valley. 
Fury Statistics or HERrepirTy. 
Color-class, sinistral young. Color-class, dextral young. 
Form and color-classes of adults. 
Plain. Plain. 
Banded. 
aa ar) 
HEREDITY OF CoLoR-CHARACTERS. HeERepIty oF Colt. 
Young. Young. 
Banded. | Total. Sinistral. Dextral. 
Adults: 
Sinistral.... 
[63.17 p. ct.] 
123 
Dextral.... 
[36.82 p. ct.] 
118- 334 
[64.67 p. ct.] | [35.32 p. ct.] 
CONCLUSION. 
The collective population of Hamuta Valley presents an aspect quite similar 
to that of the fundamental colony in Fautaua Valley. In fact, P. otaheitana amabilis 
in this region is far closer to the original stock than any other colony of the entire 
island. Nevertheless, the Hamuta association exhibits distinctive features, both as 
regards the relative numbers of sinistral and dextral individuals, and also in the 
dimensions and proportions of the shell and aperture. As a whole, it forms a 
different hereditary complex, whose characteristics can not be attributed to environ- 
mental peculiarities, for these are absolutely identical with those of Fautaua and 
of Pirai Valley on the west. Isolation merely keeps its characters intact, so to 
speak, as a condition and not as a cause of differentiation. 
