PARTULA OTAHEITANA. 145 
Tahara immediately to the west of Point Venus (plates 9, 10, and 11). The snails 
of this area agree with those of Pohaitara most closely, but the series is remarkable 
because banded sports occur—3 out of 345—while 1 plain dextral individual was 
taken that corresponds with the prevalent forms in all respects save coil. 
The three color-classes of Pohaitara occur here, although not in the same pro- 
portionate numbers; they are represented as follows: 
Sinistral: 
LETTS Manabi Bo CSO CET SOR COMETH Oo Cc DeTE Si cmreete 50 (14.49 per cent). 
TZN Bogeoeenat Sos One oe DOC Ome ene crs 13 (3.77 per cent). 
darks ARK. AS Ri SAI SA Lah SARA ape 278 (80.57 per cent). 
decorticated mvt enue te xs racer tessnsherrsr 31 (8.98 per cent). 
INCA CEA Myers i crstntarerere ete ieireyaece con eis o cia Tes 247 (71.59 per cent). 
Sinistral: Banded 
Dextral: Plain 
(0.87 per cent). 
(0.29 per cent). 
Sais MBSR aco DUCED OA Ha ROR Aer aI ae Tee 3 
The light shells (plate 26, figs. 37 to 39) are all devoid of a tinted apex. The 
medium shells (plate 26, figs. 40 to 43) have the darker apex; they are few in numbers. 
The brown shells (plate 26, figs. 44 to 47) are decorticated in one-eighth of the cases; 
the rest, amounting to a little over 70 per cent, form the prevalent class. The 
banded specimens are like similarly colored shells from Pirai (plate 26, figs. 48 and 49), 
although none of the three displays a reddish tone, either in ground-color or in the 
band itself. The single dextral shell belonged to the medium class, with the 
darkened spire (plate 26, fig. 50). 
TaBLe 81.—Partula otaheitana amabilis, Ururoa Valley. 
MEAN VALUE. 
Shell. Aperture. Length aper- 
Series. No. = Wun <> Legis 
shell, propor- 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. p. ct. p. ct. 
Sin., plain... .| 338 | 17.4526+.0299| 10.3663 .0167| 59.3462 + .0862| 9.2089 .0175| 7.1408 .0142) 77.5355 .1056| 52.6657+.0691 
banded. . 2 | 16.7000 .2146| 9.8000 .2385] 58.5000+.4769] 8.7000+.1908) 6.7000 .2862) 77.5000+1.9077| 51.5000+ .4769 
Sin, alls sooac 340 | 17.4483 .0298) 10.3629 .0168) 59.3412+.0857| 9.2059 .0174| 7.1383+.0142) 77.5353 .1055) 52.6588+.0689 
Dex., plain!... 1 | 17.4500 10.9000 61.5000 9.9000 7.9000 80.5000 55.5000 
STANDARD DEVIATION. 
Sin., plain... .| 338 | 0.8156+.0211| 0.4562+.0118| 2.3483 .0609| 0.4759+.0124| 0.3862+.0100) 2.8779 .0747| 1.8836 .0489 
banded. . 2 4500 .1517 -5000=.1686| 1.0000+.3372) .4000+.1349| .6000=.2024| 4.0000+1.3454| 1.0000+.3372 
STi Ail, Goobe 340 -8158+.0211 4583+ .0119| 2.3423+.0606) .4771+.0123) .3893+.0100| 2.8858+.0746 1.8847 = .0487 
Dex., plain.... il ll gdoedsootooadcoubEsdoodododl ooUabs So ano dnl Ind ooo uc eo ono Mea orcOma nol litrocuccis cds cried cccien crc secretes 
1Class values, hence discrepancy between per cent figure and observed. 
In statistical characters the whole colony (table 81) shows still further reduc- 
tion in the absolute measurements. ‘The striped shells are even smaller than the 
plain reversed ones, and the differences are statistically significant in all of the 
seven standard characters, excepting only in the proportion of the aperture. The 
tooth (table 82) is less developed than in the Pohaitara colony. 
