168 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
section (B), and comparing it with the section comprising shells lacking the deep- 
tinged spire (A), really significant differences appear. Finally, when the yellow- 
white and the yellow shells are taken together and contrasted with the group of 
red and orange-red shells, the differences prove to be slight except in the characters 
of the aperture. ‘There is no general statement that is warranted by these facts. 
Tas_eE 111.—Partula otaheitana rubescens, Oopu Valley. Full statistical analysis. 
Mean VALUE. 
Shell. Aperture. Length aper- 
Ngo ture + length 
shell, propor- 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. p. ct. i Dp. ct. 
VYellow-white, I..} 16) 23.4375+.1516} 12.9625=+.0832) 55.5000+.3319| 11.8500 .0636) 8.9750+.0694)* 76.6250+.4651) 50.8125 + .2842 
Yellow, II....... 82) 22.8414 .0822| 12.8610 .0360| 56.2927 =+=.1697| 11.5341+.0413] 8.7098 .0292) 75.6219=+.2046) 50.5366 .1376 
Red-orange, III..| 28) 22.6786+.1018) 13.0000+.0507| 57.3214+.2481) 11.5928+ .0662)| 8.7000+ .0436) 75.2857 + .3497| 51.1785 .1929 
IR INYo os sb 000c 146) 22.7945 + .0637| 12.8863 == .0333) 56.5822+.1537| 11.4740+.0372| 8.6014+.0249| 74.9041 .1686) 50.3219+.0968 
Yellowandred,A.| 78) 23.1538+.0915) 13.0359=+.0427) 56.3718+.1911) 11.7282+.0431] 8.8000+ .0306| 75.1795 .2192| 50.6410 .1398 
Yellowandred, B.| 194) 22.7062+.0511) 12.8382+.0254) 56.5618+.1244) 11.4454+ .0253) 8.7124+.0207| 75.2114+.1421| 50.4485 + .0855 
Viellow,y ley lier 98) 22.9388+ .0746) 12.8776 .0331) 56.1633 .1581| 11.5857 +.0369) 8.7531+.0278) 75.6224+.1875) 50.5816 .1245 
Wed ULL pLVererrr 174) 22.7759 .0560| 12.9046 .0292) 56.7012+.1357| 11.4931+.0282) 8.6172+.0221| 74.9655+.1524) 50.4598 .0901 
ANU, G00 00000006 272) 22.8306+.0462) 12.8949+ .0222) 56.5074+.1044) 11.5265+.0225) 8.6662+.0175| 75.2022+.1193) 50.5037+.0731 
STANDARD DEVIATION. 
Vellow-white, I..| 16) 0.8992+.1072! 0.4935+.0588) 1.9684 .2347| 0.3775+.0450) 0.4115+.0491) 2.7585+.3289| 1.6852+.2009 
WANO Wioscooce 82) 1.1042+.0581 4833+ .0254) 2.2779+.1200 -5542+.0292| .3925+.0206) 2.7470+.1447| 1.8475+.0973 
Red-orange, III..| 28 -7986+ .0718 -3982+ .0358) 1.9466+.1754 -5196+.0468) .3422+.0308) 2.7433+.2473) 1.5131+.1364 
IRGh UWoacoacces 146) 1.1420+.0450 -5966+ .0235} 2.7536+.1087 5550+ .0263} .4455+.0176| 3.0195+.1192) 1.7347+.0684 
Yellowand red, A.| 78) 1.2000+.0647 -5588+ .0302) 2.5031+.1351 -5645 + .0305| .4009+.0216) 2.8711+.1550) 1.8308+.0988 
Yellowand red, B.} 194) 1.0547+.0361 -5247+.0179} 2.5699 .0875 -5222+.0178) .4273+.0146| 2.9355+.1004| 1.7666+.0604 
Wellowselie lla 98) 1.0957+.0527 4860+ .0234| 2.3209+.1118 .5421+.0261) .4076+.0196| 2.7526+.1326| 1.8276+.0880 
IRGeb WN Io oo0c 174; 1.0950+.0396 -5709+ .0206) 2.6544 .0959 -5512+.0199} .4321+.0156| 2.9801+.1078) 1.7628+.0637 
7 AN eines Dieta oi 272) 1.1298 .0327 -5420+.0157} 2.5523+.0738 -5497+ .0159} .4284=.0124) 2.9172+.0844) 1.78744 .0517 
The percentage of fecund individuals (table 112) averages about 91 per cent, 
and in consequence the number of embryonic young is satisfactorily large. There 
are no noticeable indications of a differential fertility, which might give an advan- 
tage to one or to another color-class. 
TaB_LeE 112.—Partula otaheitana rubescens, Oopu Valley. Fecundity. 
No. of | Per cent | No. of | No. of Total Average Average 
gravid. gravid. eggs. | young. | contents. for all. for gravid. 
Yellow, I, II 
Red, III, IV 
