148 
VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
we may combine the four colonies and take into account all of the members of each 
association, thus weighting them according to the actual collections, while in the 
second case we may average the determinations for each character, weighting all four 
colonies equally. For obvious reasons the dextral components must be omitted. 
The figures are given in table 88. 
TaBLeE 85.—Partula otaheitana otaheitana and P. o. amabilis. 
Series. 
Fautaua, s.... 
Pohaitara, s... 
Ururoa,s..... 
Fautaua, d.... 
Hamuta, d.... 
Ururoa, d..... 
Fautaua, s.... 
Hamuta, s.... 
Pohaitara, s... 
Wruroas Sees 
Fautaua, d.... 
Hamuta,d.... 
Wrutroa Geren 
Length. 
mm. 
19.1003 + .0268 
18.3282 + .0332 
18.2797 + .0222 
17.5608 + .0273 
17.4483 + .0298 
Shell. 
Width. 
mm. 
10.9888 + .0142 
10.7097 + .0172! 
10.6657+.0111 
10.4836 .0156) 
10.3629 + .0168) 
Mean VALUE. 
Proportions. 
D. Cl: 
57.4373 + .0719 
58.4100 + .0928 
58.2998 + .0528 
59.6187 + .0683 
59.3412 + .0857 
Length. 
mm. 
9.8321+ .0142 
9.5617 +.0190 
9.4632 + .0117 
9.2588 + .0144 
9.2059 + .0174 
7.7239 .0115 
7.4979 = .0160 
7.3718 + .0097 
7.1945 + .0130) 
7.1383 + .0142 
Comparison of statistical characters. 
Aperture. 
Width. 
mm. 
78.4744 .0818 
78.2301 .1125 
77.8983 = .0621 
77.6847 + .0984 
77.5353 .1055 
Proportions. 
mm. 
Length aper- 
ture + length 
shell, propor- 
tions. 
Tooth, index. 
p. ct. 
51.4076 + .0590 
52.0467 = .0785 
51.6927 + .0405 
52.5871 .0639 
52.6588 + .0689 
2.7138+ .0267 
3.0903 + .0276 
2.8966 .0177 
2.6357 + .0288 
2.6473+.0275 
509 
289 
939 
379 
340 
19.3184 .0304 
18.5018+.0475 
17.45 
0.8961 + .0189 
-8359 + .0235 
1.0096+.0157 
-7885 + .0193 
-8158+.0211 
10.9736 = .0172) 
10.7844 .0262 
10.90 
0.4768 + .0100 
-4396+ .0122 
-5047 + .0078 
-4508+ .0110 
-4583+ .0119 
56.7447 + .0745 
58.1988 + .1118 
61.50 
STANDARD DEVIATION. 
2.4049 + .0508 
2.3409 + .0656 
2.3977 + .0373 
1.9720 .0483 
2.3423 + .0606 
421 
-9263+.0215 
166 
.9070 + .0336 
-5219=+ .0122 
-5000+ .0185 
9.8853 + .0163 
9.6506 + .0284 
9.90 
0.4769 + .0100) 0.3845 + .0081 
4833 + .0134 
-5317 + .0083 
-4164+ .0102 
4771+ .0123 
7.6667 = .0130 
7.5386 + .0216 
7.90 
-4080+ .0113 
-4324+ .0069 
-3738 + .0092 
-3893 + .0100 
77.4976 + .0937 
78.0361 + .1479 
80.50 
2.7369 + .0579 
2.8388 + .0795 
2.8229 + .0439 
2.8401 + .0696 
2.8858 + .0746 
2.2660 + .0527 
2.1353 + .0790 
-4969= .0115 
5433 + .0201 
-3943 = .0092 
-4130+.0152 
2.7600 + .0289 
3.0000 + .0377 
3.0 
51.1176+ .0644 
52.1144 .0929 
55.50 
1.9737 + .0417| 0.9069+ .0189 
1.9788 .0555| .7096+.0195 
.7772 .0125 
-8408 + .0203 
-7565 = .0194 
2.8505 + .0663 
-8880 + .0204 
2.8594 + .1058 
1The numbers of individuals are greater in the cases of tooth determinations. 
TaBLe 86.—Partula otaheitana otaheitana and P. o. amabilis. 
Fautaua, s... 
Hamuta, s... 
IDM, Eoaanod 
Pohaitara, s.. 
Ururoa, s.... 
Fautaua, d... 
Hamuta, d... 
Length. 
mm. 
—0.6721 + .0426 | —0.2791 + .0223 
[— .0485+.0399]|— .0440+ .0204 
— .7189+.0351}/— .1821+.0191 
— .1125+.0404/— .1207+.0229 
—0.8166+ .0564|— .1892+.0313 
Width. 
Shell. 
mm. 
Proportions. 
+-0.9727 + .1130 
[— .1102-.1067] 
+1.3189 = .0863 
— .2775+.1096 
+1.4541 + .1343 
-7407 + .0266 
Progressive comparison from valley to valley. 
Differences in mean value. 
p. ct. 
Length. 
mm. 
—0.2704+ .0237| —0.2260+ .0197 
-0985 = .0223)— .1261+.0187 
2044 .0185}— .1773+.0162 
-0529 = .0226)— .0562+.0192 
-2347 = .0327}— .1281+.0252 
Aperture. 
Width. 
mm. 
Proportions. 
p. ct. 
[—0.2443 + .1391] 
-3318 = .1285 
.2136+.1163] 
1494+ .1442] 
-5385 + .1766 
Length aper- 
ture + length 
shell, propor- 
tions. 
Tooth, index. 
p. ct. 
+0.6381 = .0982 | +-0.3765 + .0384 
— .3540+.0883| — .2937+.0328 
+ .8944+.0756| — .2601+.0338 
+ .9968+.1130| + .2400+.0475 
If the period of collection had been exactly the same for all four valleys, and the 
conditions of moisture also had been identical, then the characters of the variety 
as a whole, as in the first case, would best be defined by the figures for all individuals 
taken together in one series; certainly the variety is actually more abundant in 
Pirai than in Hamuta, and greater weight should be granted accordingly to the 
