PARTULA OTAHEITANA. 227 
the shell would be taken out of the third subgroup to be placed in one or the other of 
the contrasted divisions. 
The statistical analysis (table 169) shows that the apex class is made up of 
shells that are longer and narrower than those of cestata, but in general there is 
substantial agreement. As compared with sinistrorsa of other localities, this asso- 
ciation comprises shells that are by far the largest and best developed in every way. 
Like the rest of the Taiarapu specimens, they are all toothless. 
TaBLeE 168.—Partula otaheitana sinistrosa. Vaipoe Valley. Numerical relations of the color groups. 
anit Adoles- | Per cent | Per cent of 
“| cents. | of adults.} adolescents. 
Bia togucboboabeln.co eu oebo cou an oo moo ocean aOogodbE 14 13 UoSt 8.33 
cestata, faintly banded spire, clear basal whorl....... 64 28 33.68 17.95 
cestata, faint bands on basal whorl................. 68 35 35.79 22.44 
cestatasbandedmthroushoutmerrrriiteiierieiiirernn 44 80 23.16 51.28 
AWE la he a CIOHIGLO OOD GR OOR Ae Oma moot Om oo cor aD 190 EAT Gecso lel) Sloane 
TaBLe 169.—Partula otaheitana sinistrorsa. Vaipoe Valley. 
Mean VALUE. 
Shell. Aperture. Length aper- 
Seri N ture +length 
ccs: 9: shell, propor- 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm, mm. p. ct. pact. 
60060 14] 22.1000+.1305) 11.4429 .0908) 51.7143 .4626) 10.8285+.1016) 7.9714+ .0618) 73.3572+.5654| 49.0000 .4186 
cestata ..| 176) 21.7881 .0510) 11.4568 .0251| 52.4659+.1090} 10.7863+ .0288) 7.8853 .0212| 73.0228+.1263] 49.4319 .0871 
dodo 190} 21.8111+.0483) 11.4558 .0242| 52.4106+.1070} 10.7894 .0276| 7.8915+.0207| 73.0474 1242) 49.4000 .0867 
0.7238 + .0923 
1.0026=+ .0360 
-9872 + .0341 
STANDARD 
0.5038 + .0642 
4944+ 0177 
2.5665 + .3271 
2.1450+ .0771 
DEVIATION. 
0.5637 +.0718 
-5663+ .0203) .4183+.0150 
4952+ .0171 
2.1879 = .0756 
0.3432 .0437) 
3.1363 + .3998 
2.4839 + .0893 
2.3222 + .2960 
1.7131+ .0616 
5644 015 4240+ .0146) 
2.5392 + .0878 
1.7727+ .0613 
The data on fecundity may be given without tabulation. Of 140 adults 
yielding records, 104 were gravid (74.3 per cent); they contained 146 eggs and 94 
young, a total of 240, giving an average content for the gravid individuals of 2.3 
and an average for all of 1.7. Passing to the inheritance of the distinctive color- 
characters, it appears (table 170) that apex produces both its own kind and cestata 
as well, but that cestata adults bear only banded young; this result is much like that 
observed in Aiavaro. The small relative number of unbanded adults renders it 
impossible to interpret the facts as indicating a secular change in the colony. 
TaBLe 170.—Partula otaheitana sinistrorsa. Vaipoe Valley. Heredity. 
Young, 
apex. 
Young, 
cestata. 
Total. 
