84 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
than in the more inland group, but the proportionate measures are not distinctively 
different. As regards variability, the two series prove to be similar in all of the 
characters, excepting only in length of the aperture, in which respect the coastward 
shells prove to be less consistent. 
Classified according to color, the shells fall into five well-marked divisions, as 
follows: 
Class A (plate 21, figs. 32 to 34) comprises only a few individuals—3.27 per cent 
of the 1909 series—which have a shell that is almost white, marked with yellowish 
strigations across the whorls. The apex is clear and untinted. 
Class B (plate 21, figs. 35 and 36) is characterized by a deeper yellowish or 
terra-cotta color and a light ruddy purple or purplish-brown apex. These number 
5.73 per cent of the whole series. 
Class C (plate 21, figs. 37 to 41) includes 32.78 per cent of the representative col- 
lections, whose shells are ruddy brown or yellowish brown, with an apex of the same 
shade or of an intensified and deeper tint. Sometimes the shell is almost uniform 
in color, owing to the indistinctness of the transverse ashy streaks (fig. 41). 
Class D (plate 21, fig. 42; plate 22, figs. I to 4) amounting to 26.22 per cent, is 
made up of brown shells with deep brownish strigations. These have very little 
of the ruddy tinge which appears in the specimens assigned to Classes B and C. 
Now and again some of the shells exhibit a nearly uniform coloration (fig. 4). 
Class E (plate 22, figs. 5 to 8) is distinguished by a very dark purple-brown 
color and deeply tinted apex. It comprises 31.96 per cent of the 1909 series. 
TaBLeE 34.—Partula filosa. Statistical comparison of the color-classes, 1909 series. 
Mean VALUE. 
Shell. Aperture. Length aper- 
ture + length 
shell, pro- 
Width. portions. 
Length. Proportions. Length. Width. Proportions. 
mm. mm. Pp. Ct. mm. mm. p. ct. p. ct. 
A, very light.... 
B, yellowish... . 
C, reddish-brown 
14.0750+ .0839 
13.9358+ .0888 
14.0075 + .0647 
13.8875 + .0678 
14.0116 .0643 
13.9754 .0337 
9.2000 .1012 
8.9572 .0525 
9.0200 + .0375 
9.0500 + .0347 
9.0079 = .0331 
9.0262 + .0193 
65.2500 + .3674 
64.6428 + .5686 
64.2750 .2178 
65.2187 + .2370 
64.1667 = .2299 
64.5410+.1279 
7.5000 + .0477 
7.6714 .0425 
7.5500 .0389 
7.4750 .0236 
7.5359 + .0423 
| 6.5000=+ .0477 
6.4715 + .0635 
| 6.4300 .0365 
6.2938 + .0375 
6.3513 + .0308 
7.5311 .0200 
STANDARD Dey 
A, very light.... 
B, yellowish.... 
C, reddish-brown 
D, brown 
E, purple-brown. 
0.2487 + .0593 
-3482 + .0628) 
.6074+ .0458 
-5688 = .0480 
-5955+ .0455 
-5524+ .0239 
0.3000=+ .0716 
-2060+ .0371 
-3515 + .0265 
.2915 = .0246 
.3067 + .0234 
-3159+ .0136 
1.0897 = .2599 
2.2307 + .4022 
2.0431 = .1540 
1.9880+.1678 
2.1283 + .1626 
2.0936 + .0904 
IATION. 
0.1414+ .0337 
-1666 + .0300 
-3653 = .0275 
-1984+ .0167 
-3918 + .0299 
.3279+ .0142 
6.3738 + .0192 
0.1414+ .0337 
-2490 + .0449 
+3421 .0258 
-3142 + .0265 
-2854 .0218 
-3138+ .0136 
86.5000 + .3372 
84.3572 + .9383 
84.9750 + .3286 
84.1875 + .3774 
84.3718 .3255 
84.5902 + .1902 
53.5000 + .2384 
| 55.0714 .3886 
|; 53.7000 + .1434 
53.6562 + .2495 
53.5769 .2137 
1.0000 += .2385 
3.6811 .6637 
3.0821 + .2324 
3.1665 + .2673 
3.0143 + .2303 
3.1126 .1345 
0.7071 .1686 
1.5245+.2749 
1.3453 +.1014 
2.0933 .1767 
1.9791 .1512 
Turning now to the measurable characters of the five color-classes, it appears 
from the statistics of the longer 1909 series (table 34) that they differ somewhat, like 
isolated colonies of other species existing in neighboring valleys, or like the con- 
trasted color-types of clara living in one valley, such as Vaihiria. Furthermore, 
53.7213 + .1083 
1.7718 .0765 
