196 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
The classification of the adult shells, on the basis of coloration, is as follows: 
No. of Per cent No. of 
adults. | of adults. | adolescents. 
Plain: 
Whitish or very light 
Reddish bands 
Brown bands 
The first group of the plain class (plate 29, figs. 6 to 8) is made up of shells that 
are more or less decorticated derivatives of the second group; there are no such 
specimens among the adolescents, which might not be significant in view of the 
small series of partly grown individuals, and there are none among the 506 embryonic 
young—a fact of undoubted meaning. The second group (plate 29, figs. 9 to 14) 
corresponds to the “light” series of previous valleys, but it also comprises the plain 
shells with the reddish overcast of a more or less intense hue; in many cases the 
red tinge extends out upon the lip, which then exhibits a pink color. Such a 
character is only sporadic heretofore, as in Ahonu. The dark group (plate 29, 
figs. 15 to 18) includes the most typical representatives of the variety as a whole, 
although strigations are not as well marked as in the more western colonies. 
TasBLe 130.—Partula otaheitana affinis erythrea. Farapa Valley. 
Mean VALUE. 
Shell. Aperture. Length aper- 
Series. No. IRS TegEn Tooth, index.! 
shell, propor- 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. p. ct. p. ct. 
Plain, white....} 23) 18.2978+.0810) 10.6130+.0614) 57.7609 + .3425| 9.6913 .0465| 7.4130+.0489] 76.3261 .2707| 52.7174 .2345] 1.0870+.0385 
yellow. ..| 251) 17.7834 .0402| 10.2569+.0181) 57.6395 + .0912) 9.3868=+ .0201} 7.2123+.0134| 76.7868+.1134/ 52.6832 .0603) 1.1746+.0214 
brown... .| 173} 17.7916 .0496} 10.2757 .0213} 57.7543+.1221) 9.4202+ .0244| 7.2063+.0171| 76.4191+.1434| 52.8236+.0816] 1.1648 = .0230 
Banded, reddish} 40) 17.8325+.1080| 10.2800+ .0420) 57.6000=+ .2799) 9.4150+.0548) 7.2050+ .0363) 76.4750+.2903) 52.6000+.2418] 1.0233+.0155 
brown.| 95} 17.8637+.0650) 10.3568=+ .0298) 58.0474+.1488) 9.4200+ .0354| 7.2074+ .0226) 76.3316+.1708) 52.7526+.1297| 1.0928+.0241 
Rlainwyalllererr 447) 17.8130 .0301) 10.2825+ .0137) 57.6902 .0715) 9.4177+.0149) 7.2203 .0108] 76.6208+ .0845] 52.7394 .0525] 1.1663+.0151 
Banded, all... | 135) 17.8544 .0580) 10.3341+.0261) 57.9149+.1341) 9.4288+ .0283} 7.2066+ .0192) 76.3741+.1537| 52.7074+.1161| 1.0715+.0275 
INMoa600000006 582} 17.8227+ .0265) 10.2945 + .0122| 57.7423 + .0632) 9.4185 + .0133) 7.2172+.0094) 76.5638+.0744) 52.7320+.0485| 1.1439+.0123 
SranpaRp DevIATION. 
1.6669 .1658] 0.2742 +.0272 
1.4169+ 0426} .5051+.0151 
1.5909+ .0577| .4537+.0162 
Plain, white....} 23) 0.5763+.0572) 0.4368+.0434| 2.4355 .2421) 0.3309+ .0329] 0.3481+.0345| 1.9247+.1914 
yellow...| 251 -9455 + .0284 4264+ .0128| 2.1434+.0644| .4730+.0148) .3156+.0095) 2.6640+.0795 
brown...| 173 -9668 + .0360 -4166+.0115) 2.3810+.0863) .4754+.0172! .3336+.0121) 2.7964+.1013 
aa 
Banded, reddish} 40} 1.0128+.0763 4874+ 0297) 2.6248+.1979| .5136+.0387| .3405+.0256| 2.7224+.2052 
brown.| 95 -9398 + .0460 -4311+.0211) 2.1509+.1052| .5112+.0250) .3267+.0160) 2.4690+.1206 
2.2671+.1709} .1510+.0109 
1.8749 .0912} .3514+.0170 
1.6449 .0371| .4768+.0107 
2.0007 +.0821} .3085+.0194 
—_—_—$$ $ _ _—_—_ 
4448 + .0087 
Abin, All, ooo90 447 9454+ .0213 4302+ .0097) 2.2420+.0505| .4690+.0105| .3376+.0074| 2.6485+.0597 
Banded, all....} 135 -9622+.0410} .4498+.0184) 2.3106+.0948) .4876+.0200) .3310+.0136) 2.5485+.1087 
TV Giaie oieiooe 00-0 582 9494+ .0187) .4353+.0086| 2.2609+.0447| .4765+.0094| .3360+.0066) 2.6602+.0526} 1.7338+.0343 
1The numbers are respectively 23, 252, 176; 43, 97; 451, 140; 591. 
