

78 
VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
are exactly like those of Aniguac, yet marginata occurs only at the former place. 
All of the facts at hand indicate that the internal genetic factors are responsible 
for the color-characters of gibba as well as of other species; the variations in ecologi- 
cal conditions throughout the island determine only the presence or absence of any 
snails whatsoever, and they exert no qualitative effects that can be discovered. 
Series. 
Tarague: 
unicolor; © cas. c< seuas 
Santa Rosa: 
bicolor ;:. of. Gauge oss 
mitella ... 3/8 2 |e 
phea-rubra........... 
pheea-purpurea........ 
Asados: 
phea-rubra........... 
phea-purpurea........ 
Tarague: 
mnicolor...2 he. wee oe ne 
Santa Rosa: 
bicolor.«..tnees eee 
mitella. eee! ees 
pheea-rubra........... 
phea-purpurea........ 
Asados: 
phea-rubra........... 
phea-purpurea........ 
TABLE 30.—Partula gibba, Guam. Northeast Region. 
Shell. 
Width. 
MEAN VALUE, 
Proportions. 
Length. 
Aperture. 
Width. 
Proportions. 
Length aper- 
ture + length 
shell, propor- 
tions. 
| Me eee ee --.0€—©—_OoaIa>G«>—a 
mm. 
17.1395 +.0529 
17.1500 +.0588 
17.1500 +.0430 
16.5816 +.1628 
17.6833 +.2353 
mm. 
11.9175 +.0389 
11.9341 +.0402 
11.9376 +.0360 
11.6053 +.1271 
12.0778 +.1779 
?. ct. 
69.9500 +.1816 
69.5609 +.1695 
69.4307 +.1572 
69.9737 +.1835 
68.1667 +.3671 
mm, 
9.6700 +.0295 
9.7488 +.0285 
9.7851 +.0248 
9.5316 +.0690 
9.8555 +.1386 
mm. 
7.2450 +.0217 
7.2854 +.0249 
7.2624+.0179 
7.1421 +.0590 
7.3444 +.1055 
p. ct. 
p. ct 
74.8125 +.1629/56.6375 +.1166 
74.6951 +.1349|56.7073 +.1071 
74.0644 +.1503|56.9257 +.0941 
74.8158 +.2659|57.2894 +.2385 
73.7222 +.4341|55.9445 +.3018 


16.2500 
17.0125 +.0826 
17.1081 +.0526 
17.1500 
17.0630 +.0445 
17.4500+.0 
17.3941 +.0504 
17.2559 +.0672 
16.8743 +.0591 
— | eee _ SBS Wo sa Oh 
17.2250+.0348 
0.7019 +.0374 
-7896 +.0416 
-6416 +.0304 
1.0523 +.1151 
1.0467 +.1664 
11.7000 
11.4000 +.0617 
11.8488 +.0435 
11.7000 
11.8449 + .0346 
12.0000 +.1118 
11.9492 +.0425 
12.0059 +.0499 
11.7865 +.0501 
11.9214+.0273 
71.5000 
69.4167 +.2972 
69.1977 +.1577 
67.5000 
69.2826+.1455 
68.5000 + .6309 
67.6077 +.2055 
69.7059 +.3005 
69.7432 +.2178 
69.1715 +.1382 
9.7000 
9.6833 4.0532 
9.6023 +.0302 
9.3000 

9.6014 +.0242 
10.0000 +.0584 
9.6877 +.0307 
9.6471 +.0314 
9.4892 +.0357 
9.6343 +.0197 
STANDARD DEVIATION. 
0.5159 +.0275 
-5399 + .0284 
-5367 +.0254 
-8217 +.0899 
-7913 4.1258 
2.4078 +.1284 
2.2758 +.1198 
2.3431+.1111 
1.1862 +.1297 
1.6329 +.2596 
0.3913 +.0208 
.3832 +.0201 
-3695 +.0175 
-4461 +.0488 
-6166 +.0980 
7.5000 
7.1000 +.0389 
7.1558 +.0308 
7.1000 

7.1406 +.0239 
7.4000 +.0337 
7.2169 +.0303 
7.1647 +.0311 
6.9811 +.0355 
7.1472 +.0195 
0.2880 +.0153 
.3287 +.0176 
-2666 +.0216 
-3816+.0417 
-4693 +.0746 
76.5000 
59.5000 
73.5833 +.2808|56.4583 +.1798 
74.1977 +.2179)|55.8954+.1352 
75.5000 
54.5000 
74.0362 +.1713|56.1232 +.1132 
73.5000 +.3372|57.2500 +.4988 
74.3154 +.2095/55.5154 +.1232 
74.0882 +.2332/55.8529 +.1312 
73.3649 +.2081/56.0405 +.1278 
73.9857 &.1277|55.7857 +.0774 
2.1598 3.1152 
1.8108 +.0954 
2.2401 +.1063 
1.7183 +.1880 
1.9309 +.3069 
SS FS — |, — hv) s— ee ee ee 

-5999 +.0584 
-5118+.0372 
4481 +.0436 
-4228 +.0307 
2.1586+.2101 
1.5331 +:.1115 
3869 +.0376 
-2937 +.0213 
-2828 +.027 
-2998 +.0218 
2.0395 +.1986 
2.1189 +..1541 

1.5471 +.0824 
1.4376+.0757 
1.4026 +.0665 
1.5417 +.1686 
1.3426 +.2134 
1.4788 +.0413 
a©cn be 6 6 0 we mie 
1.3064+.1271 
1.3143 +.0956 
CCHS MOLE TM HLT Ce RS SOCOM RwMEL ES Pe Beer a SS Hels CK ees Beeler de SePoreevneseKesaeetileoeteers bY ee eS 4 )ls ale bole «elu hae 
.5479 +.0314 
0 
-6023 +.0356 
-5815 +.0475 
-5329 +.0418 
-6107 +.0246 
-4265 +.0244 
-3316 +.0790 
.5084 +.0300 
-4318+.0353 
4521 +.0354 
-4791+.0193 
1.7926 +.1029 
1.8708 +.4461 
2.4565 +.1453 
2.5982 4.2125 

1.9646 +.1540 
2.4244 +.0977 
.2981+.0171 
-1732 +.0413 
-3677 +.0217 
.2714+.0222 
-3219 +.0252 
3459 +.0139 
-2940 +.0619 
-1000 +.0238 
.3627 +.0214 
-2688 +.0220 
-3203 +.0251 
-3428 +.0138 
2.1099 +.1211 
1.0000 +.2384 
2.5047 +.1481 
2.0164 +.1649 
1.8768 +.1471 
2.2408 +.0903 
1.3946 +.0800 
1.4790 +.3527 
1.4728 +.0871 
1.1346 +.0928 
1.1530 +.0903 
1.3590 +.0547 
