TaBLeE 101.—Partula otaheitana rubescens, Paraura Valley. 
PARTULA OTAHEITANA. 
161 
Statistical description and analysis. 
Character. 
Shell: 
Length, mm 
Width, mm 
Proportions, p. ct.. 
Aperture: 
Length, mm 
Width, mm....... 
Proportions, p. ct.. 
Length aperture + 
length shell, propor- 
56.6798 +.1570 
All (89). 
19.1545 + .0734 
10.8438 + .0369 
Mean value. 
Yellow (67). 
Red (22). 
Difference, 
yellow com- 
pared with 
red. 
Standard deviation. 
All (89). 
Yellow (67). 
19.1530+.0901 
10.9000 + .0445 
57.0373 + .1880 
78.4101 +.1750 
9.7899 = .0383 
7.6708 + .0280 
9.8582 + .0470 
7.7089 = .0336 
78.2463 + .2074 
19.1591+.1140 
10.6728+ .0557 
55.5910+ .2075 
9.5818=+ .0488 
7.5546 + .0443 
78.9090 + .3086 
—0.0061+.1453 
+ .2272+.0712 
+1.4463 + .2800 
1.0273+.0519 
-5158+ .0261 
2.1958+.1110 
1.0935 + .0637 
.5397 + .0314 
2.2812 + .1329 
+ .2764 .0677 
+ .1543+.0556 
.6627 + .3718 
2.4478 + 1237 
Red (22). 
0.7925 + .0806 
-3875 + .0394 
1.4432 + .1467 
-5363 + .0271 
-3915 + .0198 
-5704+ .0332 
-4080 + .0237 
2.5176+.1466 
-3393 + .0345 
-3085 + .0313 
2.1460 + .2182 
tions, p. ct........} 51.0618 .1325) 51.4253 .1535} 49.9546+.1876] +1.4707+.2424| 1.8539 .0937| 1.8633+.1085] 1.3048 .1326 
moothiyae eve ceilee ws 1.9776 .0660) 1.9105+.0749} 2.0819+.1346) — .1714+.1540| .9238+.0467| .9091+.0530) .9360=:.0952 
TaBLeE 102.—Partula otaheitana rubescens, Paraura Valley. 
FECUNDITY. HeErepIty. 
R d No. of] Per cent | No. of | No. of| Total | Average | Average Young, | Young, Total 
ECOres: gravid.| gravid. eggs. | youngjcontents.|for gravid.| for all. yellow. red. Ae 
Adults: Adults: 
Yellow 67 58 86.5 88 61 149 2.6 Yellow. . 57 4 61 
IRE svs.s6) 55. 22 20 90.9 27 24 51 B® 
A Leta) osieves 89 78 87.6 115 85 200 DoS 
The inheritance of the yellow character is rather strict in the offspring of yellow 
individuals, but as in Papenoo and Faarumai the red adults bear more yellow young 
than red young (table 102). The facts seem to indicate that the yellow character 
is dominant in a Mendelian sense in crosses between adults of contrasted color, 
which would tend to be somewhat frequent where the lighter type exceeds the darker 
to the degree shown in Paraura. The whole question of a Mendelian analysis, 
however, is best relegated to a later point; for the present, the essential fact is that 
as heretofore the two color-classes breed reciprocally. 
PAPEIHA VALLEY. 
Papeiha Valley is a large element of the second order of size, bearing two rivers 
(plates 9, 10, and 14). Although its radial extent is less than that of many others, 
such as Temarua and Pirai, its watershed is broad and extensive. Between it and 
Paraura several small ravines are cut in what is a relatively compact sector of the 
island. A few snails were collected in one of these ravines, Faatautia, but none 
of them belonged to rubescens, although the locality was quite as favorable, appar- 
ently, as the contiguous valleys of larger size. 
The adult specimens of rubescens from Papeiha number 112 and fall into the two 
classes of red (plate 27, figs. 30, 31 and 35) and lighter (plate 27, figs. 27 to 29 and 
34) shells, but the latter class comprises a distinct subdivision of white decorticated 
examples—io out of 71 (plate 27, fig. 27). Decortication is virtually complete, 
