PARTULA RADIOLATA. 
39 
The tables describe 23 associations quantitatively, while 11 are omitted, 
mainly because they comprised too few individuals, although these are included in 
the proper regional and complete groupings. It is true that the series from such 
places as Salifan, outer Presidio, and many localities of the South Central Region 
Series. 
TABLE 13.—Partula radiolata, Guam. Statistical description: mean values of the fundamental characters. 
Northeast Region: 
Tarague..... 
see eee 
East Central Region: 
Barrigarda... 
Dededo...... 
SAneie) 
Whole region!.... 
Coast Central Region: 
Aniguac..... 
Whole region!.... 
South Central Region: 
Ylig, lower... 
Ylig, upper... 
Pago River... 
Pago, north.. 
Ponht..... >. 
antes t.. <s « 
Whole region 
Apra Region: 
Cabras, east.. 
Cabras, west 
Whole region 
pins ee 
eereee 
West Central Region: 
ROCMUENELTIN SS. ecnin che. cg ss 
Southwest Region: 
Umatac Salonga.... 
Umatac Pajom 
Umatac Madog 
METEZO LS 5. eee os 
Whole region 
Southeast Region: 
Inarajan..... 
Whole island 
one eee 
oue we 
No. 
Length. 
mm. 
17.1965 +.0665 
16.5637 +.0887 
16.4583 +.0433 
16.5237 +.0626 
16.5197 +.0339 
16.9311 +.0654 
17.1909 +.0836 
17.0077 +.0494 
17.1609 +.0326 
17.2220 +.0959 
16.9912 +.1079 
16.7035 +.0906 
16.5250+.0891 
16.9267 +.0577 
16.1780 +.0599 
16.1214+.0872 
16.9183 +.0122 
15.6472 +.0458 
15.3645 +.0594 
15.4203 +.0309 
15.4861 +.0307 
16.3045 +.1557 
16.9745 +.0653 
16.9591 +.0725 
17.5695 +.0704 
17.3631 +.0534 
17.3135 +.0375 
15.9895 +.0787 
16.6218 +.0188 
10.5517 +.0376 
10.3325 +.0177 

10.5872 +.0361 

10.2279 +.0143 
9.4656+.0177 
10.4091 +.0820 

10.6116+.0216 
10.1877 +.0112 
Shell. 
Width. 
mm. 
10.4455 +.0795 
10.3625 +.0216 
10.1982 +.0294 
10.5216 +.0469 
10.9636 +.0462 
Proportions. 
Dp. ct. 
61.3966 +.1658 
62.5454 +.3226 
62.8403 +.1260 
61.4293 +.1824 
62.4298 +.1008 
61.9865 +.2197 
63.9546 +.3178 

10.2824+.0186 
10.4440 +.0393 
10.1588 +.0751 
10.2767 +.0500 
9.9166 +.0556 
10.3651 +.0303 
10.0760 +.0458 
9.6810 +.0517 

9.4524 +.0266 
9.4391 +.0347 
9.4806 +.0292 
10.4736 +.0442 
10.4891 +.0438 
10.7120 4.0395 
10.7217 4.0351 
9.7473 4.0523 

62.2051 +.1847 
59.8731 +.0865 
60.7000 +.2777 
59.5888 +.2476 
61.5000 +.1934 
59.9583 +.1104 
61.2442 +.1789 
62.2200 +.1967 
60.3572 +.2141 
Length. 
mm, 
9.6896 +.0380 
9.5363 +.0686 
9.4653 +.0213 
9.2017 =6.0333 
9.4079 +.0181 
9.7054 +.0474 
9.7182 +.0424 
9.6718 +.0317 
9.3964 +.0179 
9.4840 +.0539 
9.3470 +.0630 
9.3930 +.0495 
912250 3-.0532 
9.4209 +.0352 
9.3240 +.0392 
8.9857 +.0447 

Aperture. 
Width. 
mm. 
7.0724 +.0260 
6.9182 +.0581 
6.8584 +.0157 
6.7913 +.0278 
6.8465 +.0135 
6.9324 +.0359 
7.1818 +.0343 

6.9641 +.0246 
6.6492 +.0130 
6.7560 +.0345 
6.7235 +.0487 
6.7325 +.0343 
6.5750 +.0392 
6.8814 -+.0225 
6.6760+.0273 
6.4333 +.0285 

Length aper- 
ture + length 
shell, propor- 
Proportions. tions. 
D. ct. 
Dd. ct. 
72.7586 +.1657|56.2414 +.1532 
72.3636 +.3135|57.2273 4.1899 
72.3611 +.1113/57.4792 +.0986 
73.6930 +.1626/55.4649 +.1524 
72.6667 +.0923|56.9123 +.0854 
71.5811 +.2354/57.0135 +.1538 
73.5000 +.1987/56.7283 +.2076 
71.9231 +.1661/56.6923 +.1147 
70.5829 +.0899/54.6554 +.0666 
71.1400 +.2695]/54.9800 +.2162 
71.7941 +.2494/54.9117 4.2513 
71.5697 +.1951|56.2442 +.1935 
70.8750 +.1939/55.8333 4.2000 
72.8721 +.1856|55.6628 +.1536 
71.5800 +.2130|57.4200 +.2130 
71.4048 +.3071/55.8809 +.1436 
SS | — | | — | 
60.4233 4.0657 
60.3095 +.1246 
61.3551 +.1384 
61.4531 +.1309 
61.0331 +.0799 
63.5000 +.3420 
61.5566 +.2031 
61.6454 +.1806 
60.8910 +.1252 
61.0942 +.1902 
61.1839 +.0827 
60.8948 +.2093 
61.2175 4.0397 

9.3650 +.0133 
8.5038 +.0247 
8.5319 +.0300 
8.6265 +.0255 
8.5623 +.0156 
9.3000 +.0774 
9.6698 +.0415 
9.6891 +.0382 
9.7225 +.0437 
9.6131 +.0302 
9.6832 +.0219 
9.0053 +.0394 
9.2904 +.0108 

1 Including the smaller local collections. 
6.7205 +.0096 
6.2200 +.0193 
6.2681 +.0237 
6.1953 +.0199 
6.2205 +.0121 
6.9182 +.0473 
7.0132 4.0333 
6.9655 +.0343 
6.9827 +.0277 
6.8362 +.0220 
6.9522 +.0153 
6.4421 +.0309 
6.6955 +.0076 

71.6774 +.0764/55.8129 +.0762 

71.1573 4.0671|55.2877 +.0573 
72.9381 +.1023|54.1572 +.0998 
73.1377 4.1354/55.3841 +.1372 
71.8125 +.1082/55.8906 4.1218 

72.5596 +.0752/55.1722 +.0757 
74.1364 +.2779|57.1364 +.4072 
72.3868 +.1704/56.8396 +.2051 
71.7545 +.1674/57.009 1 +.1319 
71.7406 +.1257|55.1617 +.1068 
70.9493 +.1473]55.3261 +.1508 
71.4474 +.1877|55.2632 +.1967 
71.9520 +.0375|55.7966 +.0352 


are scanty, but they are tabulated on account of their representative values; and 
even in the instances cited the descriptive constants are still useful for inter- 
colonial comparisons when due allowances are made for the larger probable errors. 
The tables contain the data for a great number of comparisons in detail, to 
limits that are set practically by the interest and patience of the student. The 

