242 
TABLE 188.—Partula otaheitana sinistrorsa. 
Mean VALUE. 
Moaroa and Taharua Valleys. 
VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
Series. 
Moaroa, cestata, sin .. 
phea, sin.... 
Moaroa, all, sin...... 
Taharua, cestata, sin .. 
phea, sin... 
shahariawallssinenerere 
18.5772 + .0432 
18.6842 + .0326 
18.6424 .0261 
10.3352+.0127 
55.4350 .1074 
55.3365 + .0962 
10.3083 + .0203 
10.3525+.0162 
55.3750 .0721 
9.4420 + .0227 
9.4688 + .0173 
9.4583=+ .0138 
Shell. Aperture. 
Length. Width. Proportions. Length. Width. 
mm. mm. p. ct. mm. mm. 
7.2041 .0187 
7.2331 .0128 
7.2218 .0107 
Proportions. 
Dp. ct. 
76.2811 = .1304 
76.3403 + .0997 
76.3171 .0793 
18.5587 + .0529 
18.5739 + .0336) 
18.5684 .0287 
10.3606=+ .0153 
55.8652 .1217 
55.6809 = .0954 
10.3830+ .0266 
10.3478=+ .0186 
55.7469 + .0752 
9.5104+ .0330 
9.4809 + .0211 
9.4913+ .0180 
7.2252 = 0248) 
7.2151+.0164 
7.2188 + .0138 
Length aper- 
ture + length 
shell, propor- 
tions. 
Do A 
50.7308 + .0864 
50.6749 + .0773 
50.6968 = .0579 
Tooth, index.) 
1.3567+.0315 | 
1.2890 + .0254 | 
1.3157+.0191 | 
75.8217 .1770 
75.9585 + .1261 
75.9094 .1028 
51.1261+.1063 
50.9780 = .0838 
51.0313 = .0660 
1.4000 + .0387 
1.3333 + .0295 
1.3571 .0235_ 
Taharua, cestata, dex . 
Moaroa, cestata, sin .. 
phea, sin.... 
Waoroaseallsintyeeer 
Taharua, cestata, sin.. 
phea, sin... 
Taharua, all, sin...... 
18.0500+.3304 
9.8323 + .1942) 54.8333+.6618 
STANDARD DEVIATION. 
9.1667 + .2233 
6.6333 + .1973 
75.5000+.0 
50.5000 + .6359 
3.0000 + .3180 
Taharua, cestata, dex . 
TaBLe 189.—Partula otaheitana sinistrorsa. 
Series. 
Moaroa, cestata, sin 
phea, sin 
Moaroa, all, sin 
1The numbers are, respectively, 171, 263; 434 
No. of 
gravid. 
Per cent 
Records. crema, 
No. of 
eggs. 
Moaroa and Taharua Valleys. 
No. of 
young. 
: 115, 207; 322. 
Total 
contents. 
Average 
for gravid. 
Fecundity. 
Average 
for all. 
81 
.89 
.86 
Taharua, cestata, sin......... 
phea, sin 
Taharua, all, sin 
Taharua, cestata, dex 
The data of heredity (table 190) are consistent for the Moaroa association. 
TaBLeE 190.—Partula otaheitana sinistrorsa. 
cestata, sin 
phea, sin 
.99 
84 
.90 
Moaroa Valley. 
Banded, | Plain, 
sinistral.| sinistral. 
Statistics of heredity. 
Taharua Valley. 
Banded,| Plain, 
sinistral.| sinistral. 
dextral. 
-00 
In 
the Taharua series there is a great preponderance of young with unbanded shells, 
no doubt owing to the attenuation of bands and their late appearance in develop- 
One plain and dextral snail was produced by a sinistral phea; this fact proves 
the origin of directly coiled snails by mutation from sinistral parents. 
ment. 
169} 0.8336+.0305} 0.3918+.0143} 2.0702+.0759) 0.4381+.0160) 0.3602+.0132) 2.5125+.0922) 1.6641+.0611) 0.5580 .0223 
263) .7854+.0230) .3902+.0114) 2.3137+.0751; .4169+.0122| .3077+.0090| 2.3137+.0751) 1.8580+.0546) .6105=.0179 | 
-8063+.0184; .3914+.0090) 2.2221+.0510) .4255+.0097| .3295+.0076) 2.4431+.0561| 1.7849+.0409} .5913+.0135 | 
-8412+.0374, .4229+.0188) 1.9352+.0860) .5254+.0233) .3951+.0175| 2.8147+.1251) 1.6912+.0752) .6157+=.0274 
-7145+.0237 -3949+ 0131) 2.0246+.0674| .4472+.0149| .3489+.0116) 2.6768+.0891) 1.7795+.0592| .6294+.0208 | 
320} = .7625=+ .0203 4055+ .0108) 1.9949 .0532) .4771=+.0127| .3662+.0097| 2.7279.0727| 1.7497+.0467| .6251+.0166 | 
3 -8485 + .2336| .4988+.1373) 1.6996+.4679| .5735+.1579| .5068+.1395| 0 1.6329 4496) .8165+.2249 
