PARTULA OTAHEITANA. 
265 
remainder are cestata (a) in 41 cases (plate 32, fig. 62) and cestata (D) with distinct 
bands in almost all of the other ror instances (plate 32, figs. 63 and 64), although 
less than a score show some suffusion and approximate cestata (c) of other colonies; 
the last are too few to be separated as a distinct subclass. 
The statistics (table 217) show that cestata (a) shells are stouter and shorter 
than the others, with shorter and relatively broader apertures, which are also more 
open than in the rest. 
The plain and banded classes are essentially alike. 
One 
point of note is that the pillar tooth is very slightly developed in the colony as a 
TaBLeE 217.—Partula otaheitana sinistralis. 
whole. 
Series. No. 
Length. 
mm. 
cestata (a) ....| 41) 18.4012+.0831 
(b+c) ..| 98) 18.7143 .0588 
cestata all.....| 139) 18.6226+.0488 
REA opogeadee 37| 18.6338 .0784 
IN e stapes 176} 18.6244 .0419 
cestata, (a) ....| 41] 0.7893=.0587 
(b+c)..| 98) .8628+.0416 
cestata, all..... 139} .8535+.0345 
pheage eye 37| .7076=.0500 
ANI segs 176} .8252=.0296 
Shell. 
Width. 
mm. 
10.5097 + .0397) 57.0122+.2208 
10.5939 + .0308) 56.5102 .1435 
10.5690 + .0248} 56.6582+.1211 
10.6189 = .0468 
10.5795 + .0219 
0.3773 + .0281 
4519+ .0218 
4330+ .0175 
4222+ .0331 
-4312+.0155 
1The numbers are, respectively, 41, 
56.7102 + .1094 
2.1163 + .0856 
Mean VALUE. 
Proportions. 
p. ct. 
56.9054 .2519 
9.6482 + .0261 
Length. 
mm. 
9.6024 .0421) 7.2512 .0335 
9.6673 + .0325| 7.2673 + .0250 
Aperture. 
Width. 
mm. 
7.2634 .0205 
9.5811+.0519) 7.2371 +.0418 
eS 
9.6341 + .0234| 7.2568 .0185 
STANDARD DEVIATION. 
2.0967 +.1561 
2.1068+.1015 
2.2719 + .1781 
0.4003 + .0298 
0.3179 + .0237 
2.1522+.0773 
4779 0230) .3678+.0177) 2.5163+.1212 
4573+ .0184) .3591+.0145) 2.5791+.1043 
4683+ .0367| .3772+.0295) 2.5299+.1983 
4604+ .0165) .3636+.0131) 2.5688 .0923 
those that were bore a goodly number of young and eggs. 
pattern seems to develop late, for the facts as observed (table 218) certainly do not 
mean that a drastic change toward a colony composed of only unbanded shells is 
taking place. 
FEcuNDITY. 
Seri R d No. of |Per cent INo. of |No. of |} Total | Average 
ark eel gravid.| gravid. | eggs. |young.|contents.|for gravid. 
cestata.... 142 97 68.3 156 107 263 2 Ui 
phea ..... 37 21 | 56.8 29 12 51 2.43 
AML, Pete 179 118 65.9 185 119 304 2.58 
TABLE 218.—Partula otaheitana sinistralis. 
Average 
for all. 
1.85 
1.36 
1.69 
Vaipuaru Valley. 
Proportions. 
p. ct. 
75.5732 = .2843]) 
75.1429+.1714 
75.2698 + .1475 
75.2568 + .2805 
51.6870+ .0993) 1 
Length aper- 
ture + length 
shell, propor- 
tions. 
p. ct. 
52.0610+.1678) 1 
51.5306 .1206) 1 
51.2838 + .1825) 1 
Tooth, index.! 
-0000 + .0 
.0297+.0114 
-1316= .0447 
-0211+.0081 
75.2670 + .1306 
2.6995 + .2010 
1.7365+.0702 
101; 142, 38; 180. 
Vaipuarit. 
1.7258+.0620 
51.6022 .0877) 1 
1.5934 .1186 
1.7696+ .0853 
1.6462 +.1361 
HEREDITY OF PATTERN. 
Young,| Young, 
plain. | banded. Total. 
Adults: 
Plaine. 9 3 12 
Banded. . 72 35 107 
sotalerre 81 38 119 
-2543 + .0090 
.0444 = .0128 
0. 
.1697+.0081 
-1438= .0057 
-4085 + .0316 
Relatively few snails were gravid at the time of collection (table 218) but 
As heretofore, the banded 
