PARTULA OTAHEITANA. 289 
the left side of the morphological sagittal plane. Less distinct revolving bands 
occur below the suture; still less frequent, and more vague, are markings near the 
base of the whorl. The general pattern, then, agrees somewhat closely with that of 
banded affinis shells and with that of otaheitana and amabilis individuals from 
Fautaua and the neighboring valley to the east, although it must be noted that the 
only banded shells in Fautaua Valley were sinistral, not dextral as here. 
The series of 1907 is made up of similar primary and secondary classes, whose 
percentage values correspond closely with those of the 1906 association; this series 
also was exclusively dextral (table 243). 
TaBLe 244.—Partula otaheitana lignaria, Tipaerui Valley. Analysis of series of 19006. 
Mean VALUE. 
Shell. Aperture. Length aper- 
Series. No. a ee Tooth, index. 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. Dp. ct. p. ct. 
Plain; light... 3. 29 | 17.8845+.1056) 10.3759+.0516) 58.0172 + .2246) 9.4380 .0422| 7.4862 .0415| 79.1552 .2575) 52.6724+.2418) 3.4483+.0777 
medium...| 286 | 17.8717+.0334| 10.4357+.0173) 58.3112+.0808) 9.4637 .0179| 7.4490 .0142| 78.7203+.1007| 52.8217=+.0800| 3.2896+ .0343 
darkens 97 | 17.8899 + .0523) 10.4918+ .0291| 58.5721=.1571) 9.5021 .0287| 7.5103 .0252| 79.0257 =+.2006) 53.0670+.1324) 3.4700+.0535 
Blainwalleyye sere 412 | 17.8767+.0276) 10.4447 + .0142) 58.3519+.0692| 9.4709+.0144) 7.4660+.0119| 78.8228 .0864) 52.8689 .0652| 3.3437 + .0259 
Banded, light....} 27 | 18.1722+.0919] 10.6259 .0374| 58.3888+.2963] 9.5222+.0485| 7.4333+.0360} 78.0926+ .3338 52.2408 .3112! 3.6296 .1008 
medium.|} 146 | 17.9000+.0467} 10.5041 =+ .0236| 58.6507 .1237| 9.4028 .0232|) 7.4014 .0195) 78.7876+.1401| 52.3767 + .0964| 3.4149+ .0444 
dark....| 29 | 17.9983=.1063) 10.3759 .0516| 57.5345 =+.2358) 9.5207 .0547| 7.4724+.0537| 78.3621=.2477| 52.8448 + .2637| 3.5172 .0908 
Banded, all...... 202 | 17.9505 .0386| 10.5020 .0193) 58.4554 .1051| 9.4356+.0198) 7.4158+.0168] 78.6337 + .1169} 52.4257 .0899) 3.4581 + .0373 
All [1906]........ 614 | 17.9010 .0224| 10.4635 .0105) 58.3860 .0579) 9.4593 .0117| 7.4495 = .0097| 78.7606+.0704| 52.7231+.0532) 3.3810 .0213 
STANDARD DEVIATION. 
Blainwlight a... 29 0.8433 .0747| 0.4050+=.0365} 1.7931.1588] 0.3367+ .0298) 0.3319+.0293} 2.0557+.1821} 1.9310+.1710) 0.6207+.0549 
medium...| 286 .8383 + .0236| .4336+.0122} 2.0276+.0571| .4488=+.0126| .3564+.0100) 2.5248+.0712) 2.0055+.0565| .7915+.0242 
darkens... 97 -7635+.0370| .4259+.0206] 2.2941+.1111) .4186+.0203} .3682.0178) 2.9290+.1418) 1.9337+.0936| .7931+.0378 
elainwallememyareiee 412 -8216+ .0195 .4293+=.0100} 2.0832+.0489} .4352+.0102| .3585+.0084) 2.6013+.0611} 1.9681=.0461| .7854+.0183 
Banded, light....} 27 .7083 = .0650 .2888=+ .0264| 2.2825+.0209| .3745+.0343) .2775+.0254| 2.5713.2360) 2.3974+.2200) .7769=.0713 
medium.| 146 -8370+.0330| .4236+.0167| 2.2156+.0875) .4156+.0164| .3489=.0138) 2.5101=+.0990) 1.7276+.0681) .7983==.0314 
dark. -..| 29 -8488=.0752) .4050=.0365| 1.8829+.1667| .4372+.0387; .4290=.0380) 1.9778+.1751} 2.1054+.1864| .7249+.0642 
Banded, all...... 202 -8280 + .0273 .4073.0136} 2.2145+.0743) .4169+.0140) .3541+.0119} 2.4629=+.0826) 1.8956+.0636| .7890=.0264 
All [1906]........ 614 -8244+ 0158) .4231+.0074| 2.1278+.0409) .4296+=.0827| .3578+.0069) 2.5882.0498} 1.9556+.0376) .7885+.0151 
1The numbers are 29, 290, 100; 419: 27, 147, 29; 203: 622. 
The association from the highest part of the inhabited area, collected in 1909, 
was markedly different in its make-up (table 243). Out of 198 individuals, 24 were 
sinistral, or 12 per cent (plate 34, figs. 41, 47 to 50, and 53 to56). In both dextral and 
reversed groups the banded members were relatively fewer than in the collections 
from the middle and lower parts of the valley (plate 34, figs. 53 to56). In coloration 
also the upland collection was peculiar, notably in the reduction of the characteristic 
strigation to such an extent that the unbanded shells presented an almost uniform 
appearance. Strangest of all, however, is the reddish tinge exhibited by some of 
the shells (plate 34, figs. 45, 46, and 51); save for the opposite nature of the coil, such 
