PARTULA OTAHEITANA. 
199 
differentiation of this whole primary variety, dubia in some valleys and zonata in 
others will become the sole or nearly exclusive kind; under such circumstances, the 
terms would justly be used to apply to secondary varieties, but at present we 
do not find that the resolution of afinis into different subdivisions, possessing 
distinctive minor characters and inhabiting separate localities, has proceeded far 
enough to warrant the specifications of secondary varieties by taxonomic terms, 
except in the case of the Farapa colony. The two color-forms appearing in the 
territory now under consideration are always genetically related to their plain 
associates, and the names applied to them are useful primarily for the accurate 
description of the present conditions of the snails belonging to the variety affinis. 
and dark groups (plate 29, figs. 30 to 33). 
FAARUMAI VALLEY. 
Among 334 adults, all but 13 are devoid of bands and fall into whitish, light, 
The banded specimens exhibit 3 stripes 
(plate 29, figs. 34 to 36), now and then of an aberrant character (fig. 36), and answer 
to the description of dubia, although Garrett assigns that color-form to a valley 
about 8 miles from Papenoo, to be identified with Mahaena in all probability. 
TasLE 133.—Partula otaheitana affinis. 
Faarumai Valley. 
MEAN’ VALUE. 
Shell. Aperture. Length aper- 
Series. No. pur eucnech Tooth, index. 
shell, propor- 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. Dp. ct. p. ct. 
Plain, white...| 20) 15.7550+.1044| 9.2900 .0629) 58.9500+.2359| 8.1200 .0602) 6.4000+ .0472| 78.7000 .4228) 51.5500 .2633) ............ 
yellow...) 72) 15.5459+.0504) 9.2084+.0270) 59.1944=+ .1604| 8.1388+.0294| 6.4028+ .0229| 78.5833+.1825| 52.2640+.1543) ............ 
brown...| 208) 15.5145+.0301| 9.2798 .0168) 59.7404 .0919) 8.1855=.0172) 6.4202 + .0132) 78.3413+.1089| 52.6730+.0849| ............ 
Blainwallin.... .- 300) 15.5380+.0252) 9.2634+.0140) 59.5566+.0770) 8.1700+.0145) 6.4147+.0111| 78.4233+.0920| 52.5000+ .0727| 2.4267 + .0346 
Banded....... 13] 15.5577+.0944| 9.3461+.0690} 60.5084+.2899 8.2692+.0686| 6.4539 .0490) 77.9615 .5168} 52.9615 .3166|) 2.1539+.1615 
/N| oo wee Beate 313) 15.5388+.0245| 9.2668+.0132) 59.5767+.0748| 8.1741+.0142| 6.4163+.0107) 78.4041+.0907| 52.5191+.0713) 2.4154+.0341 
STANDARD DEVIATION. 
Plain, white...| 20) 0.6924+.0738) 0.4170+.0444| 1.5644+.1668| 0.3995+.0438] 0.3130+.0333} 2.8035+.2989| 1.7457+.1862| ............ 
yellow...| 72 -6348 + .0356 -3398=+ .0146) 2.0182+.1133| .3706+.0208| .2887+.0162) 2.3086+.1290) 1.9415+.1091] ............ 
brown...| 208 -6444=+ .0213 -3586+.0114) 1.9660+.0649| .3682=.0121|) .2835+.0093) 2.3285+.0770) 1.8158+.0600) ............ 
Plainyall: 5... 300 .6481+ .0178 -3598+.0099} 1.9766+.0554) .3717+.0102} .2869+.0078| 2.3617 .0650| 1.8672+.0514| .8896+.0244 
Banded....... 13 .5045 = .0667 -3692 = .0488) 1.5500+.2050) .3667+.0487| .2620+.0346| 2.7628 .3664| 1.6923+.2239) .8635+.1142 
AU Rielacisieccs | OLS .6427 + .0173 -3467+ .0093| 1.9630+.0529} .3720+.0100) .2804+.0076| 2.3814+.0641| 1.8712+.0504| .8938+.0255 
TasLe 134.—Partula otaheitana affinis. 
No. of | Per cent] No. of 
gravid.| gravid. 
Frcunpiry. 
eggs. 
No. of 
Total 
Average 
young. |contents.|for gravid. 
Faarumai Valley. 
Average 
for all. 
HEREDITY. 
Young, 
plain. 
Young, 
banded. 
