PARTULA OTAHEITANA. 
285 
Ill. The colonial characters are manifested in (a) relative numbers of unbanded 
and cestata individuals; (b) differentiation in the phea class of typical crassa; (c) in 
the presence of red and yellow classes; (d) in the statistical determinations. 
in the last-named connection are presented anew in summary (tables 239 and 240) 
and in graphic form (table 241). 
TaBLeE 239.—Partula otaheitana crassa. 
The facts 
Summary statistical description. Mean value. 
Group and valley. 
[sintstralis]: 
Southern crassa: 
Vaitupa 
Atitara 
Orofere 
crassa occidentalis: 
Papehue 
Northern crassa: 
Maruapoo 
Punaruu 
crassa aberrans: 
Taapuna 
TABLE 
Group and valley. 
sinistralis: 
Waipuariiin. «ame 
Southern crassa: } 
Waitupal........- \ 
INCItATA. 6. os cae es \ 
@roferon. 2.2.5: 
crassa occidentalis: 
Papehue......... 
Northern crassa: S 
ENGIN Gacareeree 
Maruapoo....... \ 
Punaruu......... 
crassa aberrans: \ 
Taapuna 
i erie 
described for comparison with other divisions of Partula otaheitana. 
No. 
240.—Partula otaheitana crassa. 
Length. 
mm. 
—1.4583+.0501 
4455 + .0506 
+ .8182= .0649 
— .3779+.0689 
.6745 = .0553 
-6016+.0581 
.2304 + .0487 
.1834+.0470 
-8755 + .0492 
Length. 
mm. 
18.6244 .0419 
17.1661 + .0274 
16.7206 + .0426 
17.5388 + .0490} 10.4714 .0303 
17.1609 = .0230 
17.8354 .0503 
17.2338 .0291 
17.0034 .0390 
17.1868 .0263 
18.0623 = .0416 
Shell. 
Width. 
mm. 
10.5795 + .0219 
9.6785 = .0135 
9.7131 .0214 
9.9469 + .0116 
10.1088 + .0262 
9.9917 +.0147 
9.9511 .0215 
9.9943 = .0152 
10.4744+ .0199 
Proportions. 
p. ct. 
56.7102 +.1094 
56.3139 + .0800 
58.0163 + .1196 
59.6327 + .1303 
57.8827 + .0632 
56.4489 = .1438 
57.9510 .0755 
58.4173 + .1374 
58.1054 .0771 
57.9064 = .0995 
mm. 
Length. 
9.6341 + .0234 
9.0697 + .0151 
9.0176 .0251 
9.4684+ .0271 
9.1315 .0124 
9.2693 = .0308 
8.9015 + .0149 
8.7662 + .0221 
9.0771+.0144 
9.6644 + .0207 
Aperture. 
Width. 
mm. 
7.2568 .0185 
6.7694 .0121 
6.7771 + .0193 
7.1418 .0220 
6.9157 + .0097 
6.9555 + .0218 
6.9078+.0121 
6.8549 + .0185 
6.7375 +.0115 
7.1521 + .0173 
1The numbers are larger in nearly all cases. 
Shell. 
Width. Proportions. 
mm. p. ct. 
—0.9010+.0257) —0.3963+.1355 
[+.0346+ .0253]) +1.7024+.1439 
+.7583 + .0371 | +1.6164+.1768 
—.5245 + .0324| —1.7500+.1448 
+.1619+ .0287 | —1.4338+.1570 
—.1171+.0300 | +1.5021+.1624 
[—.0406+.0260]| + .4663+. 
[+.0432+ .0263]|[— .3119+. 
+.4801+.0250 |[— .1990=+. 
1568 
1575] 
1259] 
Length. 
mm. 
—0.5644+ .0236 
[—.0521 + .0293] 
+.4508 + .0369 
— .3369 + .0298 
+.1378 + .0332 
— .3678+ .0342 
—.1353+.0267 
+.3109 + .0264 
+.5873 + .0252 
Progressive comparison of colonies. 
Proportions. 
p. ct. 
75.2670 .1306 
74.5820 .0981 
75.0425 = .1247 
75.3469 = .1252 
75.6339 = .0689 
74.9599 = .1561 
77.4975 = .0849 
77.9361 .1408 
74.1322 = .0869 
73.8790 .1285 
Differences in mean value. 
Aperture. 
Width. Proportions. 
mm. p. ct. 
—.04874= .0221| —0.6850=+ .1633 
[+.0077 + .0228]} + .4605+.1586 
+.3647 + .0293 |[-+ .3044+.1767]][ 
—.2261+.0240| + .2870+.1429 
[+.0398 = .0239]| — .6740+.2116 
[—.0477 + .0249]} +2.5376+.1777 
—.0529+ .0221| + .4386+.1644 |[ 
—.1174+.0218 | —3.8039+.1654 
+.4146+ .0208 |[— .2532+.1551] 
Length aper- 
ture + length 
shell, propor- 
tions. 
(Do Gi 
51.6022 + .0877 
52.7461 + .0666 
53.8464 .1066 
53.9184 .0965 
53.1078 +.0519 
51.9015 +.1139 
51.6255 + .0593 
51.4775 + .1065 
52.7414 .0549 
53.4132 + .0826 
Length aper- 
ture + length 
shell, propor- 
Tooth, index.t 
1.0444 = .0128 
2.3739 + .0372 
2.7386 + .0440 
3.2842 + .0402 
2.7600 .0188 
1.6409 + .0437 
1.5909 + .0280 
3.0074 .0391 
2.7882 + .0196 
2.4234 .0423 
Tooth, index. 
tions. 
p. ct. 
+1.1439+ 1101) +1.3295 + .0393 
+1.1003+.1257| + .3647+.0576 
+ .0720+.1438]| + .5456+.0596 
— .8106+.1109} — .5242+.0444 
—1.2063+.1263 | —1.1191+.0476 
— .2760+.1284 |[— .0500+.0519] 
— .1480+.1219]) +1.4165+.0481 
+1.2639+.1198| — .2195+.0437 
+ .6718+.0992| — .3648=+.0466 
IV. Combining the figures for all valleys, the primary variety as a whole may be 
As before, the 
combination may be effected in two ways: by uniting all shells into one series 
of variates, and by averaging the several valley types (table 242). 
figures has a definite biological significance. 
Each series of 
