
Series. 
Tumon: 
oy ha LO eee a or 
Oco: 
PRCUNOENTIIE fies oa. ue os 
TL a 
mitella-rubra.......... 
vespera-rosea.......... 
vespera-cyanea 
Meee wWisia weaves Gee 
Timoneng: 
bicolor 
Agafia: 
MERPMNRE 8 pals (ocho 206 sin oo. 
Aniguac: 
bicolor 
castanea-purpurea 
vespera-cyanea........ 
i 
Cemetery: 
OSE nee eee 
Presidio inner: 
CS Sa 
Presidio outer: 
mitella 

PARTULA GIBBA, GUAM. 
TABLE 40.—Partula gibba, Guam. Coast Central Region—Continued. 
STANDARD DEVIATION. 
Aperture. 
Width. 
Proportions. 
SS ee ee 

mm 
0.1500 +.0505 
1500 +.0505 
3090 +.0557 
“(1500 +.0505 
6000 +.2023 
-4641+.0591 
-6833 +.1881 
3833 +.0691 
4437 +.1222 
.5075 +.0625 
-6018 +.0563 

mm 
0.1000 +.0337 
1000 +.0337 
2138 +.0385 
"(2000 +.0674 
5000 +.1686 
3673 +.0468 
-3279 +.0903 
-2356 +.0424 
3570 +.0983 
.3383 +.0416 
4564 +.0427 

Pp. ct. 
1.5000 +.5058 
0 
0.8330 +.1501 
5000 +.1686 
5000 +.1686 
2.2588 +.2879 
1.0000 +.2753}. 
1.1249 +.2028 
4330 +.1192 
1.4360+.1768 
2.2390 +.2094 
-5025 +.0977 
5774 +.0479 
-5767 +.0510 
-9147 +.0952 
.7373 4.0254 
-3000 +.1012 
3000 +.0715 
-7541 +.0243 
.7246+.0561 
.5379 +.0326 
5569 +.0485 

3399 + .0662 
-4749 + .0394 
-3615 +.0320 
-6031 +.0627 
5718 +.0197 
-1000 +.0337 
.3605 +.0860 
5761 +.0185 
5502 +.0425 
3954 +.0240 
-4053 +.0353 


2.4324 +.4737 
2.5098 +.2084 
mm 
0.1000 -.0337 
.2000 + .0674 
3681 +.0663 
-3000 +.1012 
3207 +.0409 
3840 +.1057 
.2060 +.0371 
-3605 +.0993 
3492 + .0430 
3343 4.0312 
-2687 +.0523 
.3204 +.0266 

1.8557 +.1643 
1.6755 +.1744 
2.0135 +.0694 
2.0000 +.6745 
2.3452 +.5582 
2.0151 +.0649 
1.7794+.1377 

1.5814+.0957 
2.1092 +.1836 


-3605 +.0319 
4136 +.0430 
-4267 +.0147 
-2000 +.0674 
-2958 +.0705 
4450 +.0143 
4717 +.0365 
-2966+.0179 
.2619 +.0227 




mm 
0.1000 +.0337 
-1000 +.0337 
.2321+.0418 
-3000 +.1012 
-2638 +.0336 
-1658 +.0456 
.1979 +.0356 
-2958 +.0814 
.2909 +.0358 
.2365 +.0221 
-0745 +.0145 
-2311+.0191 
-2413 4.0213 
3343 4.0348 
3263 +.0112 
-1000 +.0337 
-8485 +.2023 
-3302 +.0106 

3427 +.0265 
.2354 +.0142 
2449 + 0213 


p. ct 
1.5000 +.5058 
5000 ++.1686 
2.2316 +.4023 
1.0000 -£.3372 
5000 +.1686 
1.9587 +.2497 
1.4794+.4073 
1.6414+.2958 
.8291 +.2282 

2.3795 +.2930 

1.8525 +.1707 
1.6749 +.3261 
1.8899 +.1569 



2.2171 +.1963 


2.6210 +.2728 
1.8260 +.0630 
-5000 +.1686 
1.0000 +.2384 
1.9404 +.0625 
2.2796 4.1763 
1.6859 +.1021 
1.7435 +.1518 



89 
Length aper- 
ture + length 
shell, propor- 
tions. 
Pp. ct. 
1.0000 +.3372 


1.0000 +.3372 
1.3997 4.2523 
0 
-5000 +.1686 
1.5518 +.1978 
-8291 +.2282 
1.6903 +.3047 
-8660 +.2384 
1.4697 +.1822 
1.1991 -.1121 
1.3744+.2675 
1.2560 +.1043 

1.8824 +.1666 


1.9795 +.2060 
1.6606 +.0573 
0.5000 +.1686 
1.5000 +.3576 
1.7670 +.0570 
T9979 +-1236 
1.2088 +.0732 
1.9821 +.1726 

What has been said concerning structural differentiation is equally true for 
the white sutural border which varies independently of the distinctive modes 
of coloration. And finally, the degree to which the tooth may be developed varies 
colonially and not directly in correspondence with a particular color-pattern; the 
summary in this connection is given in table 44. While it is true that the per- 
centages differ in the several classes, the fact of the matter is that the general 
absence of a callus in bicolor, for example, is due to the weak development of 
that structure in the colonies where this coloration is more often displayed. Con- 
versely phea and mitella-rubra display higher frequencies for the tooth, because 
their color-patterns are particularly abundant in colonies which also possess the 
