PARTULA CLARA. 
77 
ured characters; the color-characters can not be formulated in quantitative terms 
in the same way, and hence they may be passed over in the present summary, 
although it must not be forgotten that in the case of such a form as marmorata it 
is a quality of this nature that serves as a diagnostic varietal distinction. 
next place, the statistical values of the differences in mean value, in progressive 
order, are given in table 30, with their probable errors. 
In the 
Finally, table 31 shows 
graphically the changes in progressive geographical order, in the total ranges as 
well as in the mean values of the several characters. 
Variety. 
parva 
marmorata: 
Southern 
Taiarapu 
Eastern 
prima (?): 
TaBLeE 29.—Partula clara. 
No. 
Length. 
mm. 
14.8720 = .0602 
15.4547 + .0826 
14.8717+.0361 
15.9607 + .0999 
15.1206+ .0263 
15.5318 .1036 
15.3000 + .0536 
15.4460 .1148 
15.7600+ .1513 
Statistical description of primary varieties. 
Shell. 
Width. 
mm. 
8.3203 = .0350 
8.6111+ .0429 
8.5478 + .0212 
8.8429 = .0518 
8.9227 + .0131 
8.8819 = .0402 
8.9256 += .0260 
8.8000 = .0572 
9.1400 + .0800 
Proportio 
p. ct. 
55.6186=+. 
55.7857=. 
57.5000+. 
55.4286+. 
58.9431+. 
57.1364+. 
58.2820=. 
56.9286+. 
57.9000=. 
TaBLe 30.—Partula clara. 
Progressive comparisons of primary varieties. 
Variety. 
angusta.... 
prima...... 
marmorata: 
Southern . 
Taiarapu. 
Eastern. . 
prima (?): 
(Papenoo.) 
Length. 
mm. 
+0.5827 = .1022 
— .5830+.0901 
+1.0890.1062 
— .8401+.1033 
4112+ .1069 
2318+ .1166] 
1460+ .1267] 
.3140 = .1899] 
Shell. 
Width. 
mm. 
+0.2908 + .0554 
[—.0633 + .0478] 
+.2951+.0560 
[+.0798 = .0534] 
[—.0408+ .0423] 
[+.0437 + .0479] 
[—.1256+ .0628] 
Proportions. 
p. ct. 
[+0.1671+.2445] 
+1.7143 + .2300 
—2.0714+ .3390 
+3.5145 + .3237 
— 1.8067 + .2866 
+1.1456+ .3071 
—1.3534+ .3129 
+.3400 + .0983 
(+ .9714+.5493] 
ns. Length. 
mm. 
1525 
1912 
1279 
3140 
0792) 8.5808+.01 
2754 
1359 
2819 
9.0213 .05 
4514 
Length. 
mm. 
{[-+0.1067 + .0599] 
—.1632+ .0493 
+.5584+ 0621 
—.1906+ .0608 
+.4405 + .0538 
[—.0060+.0593] 
[—.0011+.0721] 
[—.1142+.0848] 
8.2695 + .0402 
8.3762 + .0444 
8.2130 .0215 
8.7714 .0583 
9.0153 + .0302 
9.0142 = .0655 
8.9000 = .0539 
Combining all of the available 
Aperture. 
Width. 
mm. 
6.1881 + .0300 
6.1793 + .0320 
6.2406+ .0172 
5.9785 + .0408 
73) 6.4349 .0109 
10) 6.4394 .0515 
6.5615 = .0214 
6.5400 + .0451 
6.4928 + .0465) 
Mean value. 
Proportions. 
p. ct. 
74.8051+ .1544 
73.7381 .2123 
77.1014+.1351 
67.8928 + .4220 
74.9431 = .0933 
71.2879=. 
72.4872=. 
71.7500=. 
1147 
1318 
1791 
73.5000 = .1907 
Length aper- 
ture + length 
shell, pro- 
portions. 
p. ct. 
55.3474. 
54.1984 .1901 
55.0436 .1038 
54.8572 = .2266 
56.6216 .0666 
1479 
58.0152. 
58.9871=. 
58.3571=. 
2086 
1037 
2378 
56.1000 + .1477 
Aperture. 
Width. 
Proportions. 
Mean value. 
Length aper- 
ture + length 
shell, pro- 
portions. 
mm. 
[ —0.0088 + .0439] 
.0613 + .0363] 
2621+ .0443 
4564+ .0422 
0045 + .0526] 
IR 
= 
[+ 
1221+.0558] 
.0687 = .0512] 
0472 = .0655] 
D-Cts 
—1.0670+.2625 
+3.3633+.2516 
—9.2086 + .4431 
+7.0503 + .4322 
— 3.6552 .1479 
+1.1993 + .1747 
— .7372+.2224 
+1.7500+ .2616 
Dp. ct. 
—1.1490 = .2409 
+ .8452+ .2169 
[— .1864+.2492] 
+1.7644= .2362 
+1.3936+ .2189 
+ .9719+ .2330 
[— .6300+.2594] 
—2.2571+.2799 
summaries, one result appears with great clearness, namely, the fact that a local 
variety differs from the average to different degrees in different characters. 
To illus- 
trate by a single example, P. clara angusta, from Tereehia Valley, is far above the 
average in shell length, only slightly wider than the average, but decidedly below in 
proportions; the aperture is also much elongated, but the width falls greatly below 
the general average, and consequently the relative width of the aperture deviates 
excessively from the general condition. Comparing this colony with prima and minor, 
