252 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
whorls, while the middle band has become a narrow and faint marking (plate 32, 
figs.6to8). The spire, however, still displays distinct bands, so far as they are not 
covered by whorls added later. 
The unstriped shells other than apex amount to 91 among the adults. Their 
class is still to be called phza (plate 31, figs. 60 to 64), although much variation occurs, 
from deep brown (solida) specimens through confluens forms to others that are vaguely 
strigated (fig.64). Like the phea class of Moaroa, etc., this group is plainly hetero- 
geneous, yet it is not interruptedly differentiated into well-marked subdivisions, as 
it is in neighboring sinzstralis associations. 
TaBLeE 197.—Partula otahettana sinistralis. Teohu Valley. 
Mean VALUE. 
Shell. Aperture. Length aper- 
Series. No. Sarigseses Tooth, index. 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. p. ct. mm. mm. pct Dacte 
apex, sin....| 35) 17.4585 .0930} 9.7400 .0490| 55.7286 .1948) 8.8243 .0517) 6.6600+.0411) 75.4143 .2237| 50.6428+ .1988) 2.8572+.0950 
cestata, sin...| 331) 17.2569 .0289} 9.9665+.0149) 57.6299+.0776) 8.8946+.0167) 6.7936+.0129) 76.3368+.1009| 51.4033 .0676| 2.5976 + .0267 
phea, sin....| 91) 17.2126+.0504) 9.8319 .0285) 57.0385 = .1566 8.8451 .0270) 6.6956+ .0231| 75.5329 .1727) 51.2791 .1192| 2.9121+ .0487 
ING Stilooooac 457| 17.2636 .0244) 9.9222+.0129) 57.3665+.0681| 8.8794+.0138) 6.7639+.0110| 76.1061 + .0834) 51.3403 .0565| 2.6797 + .0232 
STANDARD DEVIATION. 
apex, sin.....| 35) 0.8161+.0658! 0.4297 + .0346| 1.7086+.1377| 0.4535+.0365) 0.3603+.0291} 1.9621+.1582| 1.7426+.1406] 0.8330 .0672 
cestata, sin...} 331 .7808=.0204 .4011+.0105| 2.0923+.0549| .4509+.0118} .3484+.0091) 2.7213=.0713) 1.8228+.0478|) .7230+.0189 
phea, sin..... 91 -7137+.0356| .4024.0201) 2.2154+.1107) .3821+.0191| .3274+.0163) 2.4425+.1221) 1.6863+.0843] .6892+.0344 
INV, BEVs 00000 457 .7723+.0172| .4103+.0091) 2.1583+.0481) .4390+.0097|} .3487+.0078) 2.6433+.0590) 1.7918+.0399| .7379+.0164 
1The numbers are, respectively, 35, 333, 91; 459. 
TaBLeE 198.—Partula otahettana sinistralis. Teohu Valley. 
FEcunpITY. 
: No. of | Percent | No. of | No. of Total Average Average 
Series Records. : : , 
gravid.| gravid. | eggs. | young. | contents. | for gravid. for all. 
IOs soo0c 409 320 78.2 472 129 601 1.88 1.47 
19 Ore 49 41 83.7 65 35 100 2.44 2.04 
Data or HEREDITY. 
Young, | Young, | Young, 
sinistral,} sinistral,) dextral, | Total. 
plain. | cestata. | banded. 
Adults: 
Blain’. frane hans Giaie © sys lene OGle he ae ee ae 27 16 1 44 
Cestatarram cimial scis lee ce il ey Pic Ga cents on tere 46 74 120 
Total tee nice ccpste Qe ase cards dteelel eiaetenccel se mehexsentei era 73 90 1 164 
In statistical respects (table 197) the colony as a whole differs from the sinis- 
trorsa association from Taharua, to degrees that are all the more remarkable in view 
of the proximity of that valley and in view of the connecting forests between it and 
Teohu. The three color-classes differ znter se, but rarely with statistical definiteness. 
