PARTULA OTAHEITANA. 153 
Tase 91.—Partula otaheitana rubescens, Ahonu Valley. Statistical analysis. 
Mean. Difference Standard deviation. 
Ch between 
aracter. 
yellow and 
All (145). Yellow (78). Red (67). red. All. Yellow. Red. 
Shell: 
length,mm.... 
width, mm..... 
20.6603 + .0513 
11.3166+.0296 
20.8969 + .0705 
11.3487 = .0431 
20.4664 + .0783 
11.2791 + .0398 
+0.4305 + .1054 
+.0696+ .0586 
0.9517 + .0377 
.5291+ .0209 
0.9236+ .0498 
-5640= .0305 
0.9472 + .0554 
4827+ .0281 
proportions, p. ct...| 54.6379 .1295] 54.3462+.1703) 54.9776+.1903) —.6314+.2553) 2.3126+.0916) 2.2308+.1204) 2.3585+.1346 
Aperture: 
lengthyem meer 10.2766 .0286] 10.3564 .0392) 10.1836+.0405) +.1728=+.0563) .5106+.0202) .5133+.0277| .4913+.0286 
WAGKAN, TEN, GaoGg0006 7.7662 + .0236) 7.7975+.0347| 7.7299+.0310| +.0676+.0465| .4215+.0167| .4549=+=.0245| .3758=+.0219 
proportions, p. ct.. 
Length aperture + 
length shell, propor- 
tions, p. ct..... 
.| 75.4379 +1540 
75.1282 + .2308 
75.7988 + .1907 
49.6586+.1016 
49.6539 + .1294 
49.6642 + .1602 
—.6706+ .2994 
2.7498 + .1098 
3.0217 + .1632 
2.3437 + .1348 
—.0103 + .2059 
1.8144 .0718 
1.6952+ .0914 
1.9439 + .1133 
Records. 
Yellow. . 
Reddish. 
TaBLeE 92.—Partula otaheitana rubescens, Ahonu Valley. 
Tooru. 
None.| Trace.|Tooth.| Large.|Very large. 
Mean value. 
gravid. 
69 
58 
FECUNDITY. 
No. of} Per cent | No. of| No. of 
gravid, 
eggs. 
Total 
NN Sac 
Average 
young.|contents.| for gravid. 
Average 
for all. 
2.4937 + .0903 
2.0299 .1235 
2.2809 .0675 
1.2092 .0477 
Standard 
deviation. 
1.1893 .0638 
1.4997+ .0873 
Adults: 
Yellow. . 
Reddish. 
HEREDITY. 
Young, |Young, Total 
yellow. 
31 6 
6 24 
red. 
37 
30 
In spite of the low degree of fecundity (table 92), at least at the time of collec- 
tion, the statistics of heredity (table 92) are ‘of much interest. 
Fach class produces 
its own kind in the larger number of instances, but young of the contrasted color 
also appear. Cases occur among both kinds of adults where two embryonic snails 
differ from one another; in other instances the young may be all alike, but all 
different from their parent in the ground-color. It is a remarkable coincidence that 
the numbers of red and yellow embryonic snails correspond exactly with the numbers 
of gravid yellow and red adults. Scanty as the data may be, the colony seems to be 
stable as far as relative numbers of its two component classes are concerned. 
PAPENOO VALLEY. 
Passing by Faaripoo Valley, which yielded only two living adult rubescens in a 
total collection of 313, we reach the great valley of Papenoo (plates 9, 10, and 11). 
In a geographical and topographical sense, this constitutes the largest area that is 
continuously habitable for Partule. It comprises the extensive and almost circular 
