66 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
It remains to be noted that the banded specimens of minor are decidedly 
different from shells with bands found in other valleys, and also that in other respects 
they conform to the type of the unbanded shells of their respective valleys. The 
latter point is especially clear in the case of the Tiamao shells (fig. 42, plate 20), which 
have not only the form but also the characteristic light ground-color of their plain 
associates. 
TaBLe 23.—Partula clara minor. Statistical description. 
Mean VALUE. 
Shell. Aperture. Length aper- 
ture + length 
Valley. No. shell, pro- 
Length. Width. Proportions. Length. Width. Proportions. portions. 
mm. mm. p. ct. mm. mm. p. ct. p. ct. 
Orofere.........) 27 | 14.9611+.0579) 8.4778 .0369| 56.5370+.2460) 8.3222+.0395|] 6.2111+.0348] 74.2888 .2070| 55.5370+.2148 
tI taro eer 32 | 14.6874 .0578) 8.2688+.0348| 56.4063 .2072) 8.0688 .0438) 6.1312 .0327) 75.6250+.2695| 54.8468 .1802 
WERE. oo0c000 38 | 15.1605 .0883| 8.7315+.0447| 57.7631+.2757| 8.2948 .0428| 6.3105 .0430) 76.2631 .2059| 54.5527 +.2097 
Vaipuarii....... 20 | 14.5700 .0875) 8.6700 .0507| 59.4000 .2331| 8.0600 + .0482| 6.3000 .0477) 77.7000 +.2904| 55.0500 + .2499 
INEMTIEO> 5000000 21 | 14.8071 .0648) 8.5761+.0357) 58.0238 .2634| 8.2905 .0518) 6.2620+ .0347 75.5952 .3716| 55.6429 + .2883 
All.............) 138 | 14.8717£.0361) 8.5478+.0212| 57.5000+.1279] 8.2130+.0215| 6.2406+.0172| 77.1014 .1351] 55.0436+.1038 
STANDARD DeyIATION. 
@rofere yee eet 0.4458+.0409) 0.2845 + .0261| 1.8950+.1740| 0.3047+.0280) 0.2685+.0246) 1.5947 .1464) 1.6551+.1519 
INGWESB 5000006 32 4848+ .0409| .2920+.0246) 1.7384+.1465| .3678.0310| .2743+.0231| 2.2606+.2695|} 1.5119=.1274 
Waitupaseeeener 38 .8068+.0624| .4091+.0317) 2.5198+.1950) .3913+.0303| .3932+.0304| 1.8824+.1457| 1.9172+.1484 
Vaipuarii....... 20 .5801+.0618| .3362+.0358 1.5459-+.1648) .3200+.0341) .3162+.0337) 1.9261+.2053| 1.6575+.1767 
shiam aon 21 4403+ .0458) .2428-.0253| 1.7893+.1863} .3517+.0366| .2360+.0246) 2.5242+.2630) 1.9587+.2041 
Altea o oe 138 .6303+.0256| .3703+.0150) 2.2295+.0905| .3753.0152) .3001.0121) 2.3545+.0956| 1.8097+.0734 
Partula clara angusta var nov.—Tereehia Valley. 
The shells of Tereehia Valley, like those of Aoua, are absolutely distinct from 
those occurring in the adjacent valleys on either side. ‘They are large and slender, 
with an extraordinarily narrow aperture, and therefore constitute a variety which 
may be called angusta; 28 of 33 specimens were light (figs. 2 and 3, plate 21); and 11 
of these bore 22 young snails of the same color class; of the 5 dark examples (fig. 4, 
plate 21), 2 bore 4 dark young. No banded shells were taken here. 
TaB iE 24.—Partula clara angusta. Statistical description. 
Empirical Empirical Standard 
Character: range. mode. ANTEREISES deviation. 
Synth Werqan, TVG O66 ooo HOO D000000000000000000 14.15 to 17.15 16.55 15.9607 .0999 | 0.7834 .0706 
width; mm eee)s a ciersterstaa etelelecelevsioinies Metre dedO 9.70 | 8.70and 9.10 8.8429 .0518 .4065 = .0366 
Proportions wpermcentaemrerceieecier leet: 50.5 61.5 56.5 55.4286 .3140 | 2.4629+ .2219 
PN AHAMT WEGMAN, WING acannagc0Hc0000D000000008 7.70 9.50 8.70 8.7714 .0583 .4573 .0412 
width), mms, «550s syepexoovere store rove spore aye susie 5.30 6.70 6.10 5.9785 .0408 . 3200 .0288 
OVOP LOV MALY NS}, fry ANE Goo000000000000C 63.5 41S 66.5 67 .8928= .4220 | 3.3095 .2982 
Length aperture + length shell, proportions, p. ct. .| 50.5 58.5 54.5, 55.5 54.8572 .2266 | 1.7771+.1601 
1Only 1 shell exceeds 71.5 per cent in this dimension. 
The most obvious distinctive character is the narrowness of the aperture 
(table 24), that differs from the like feature of all other valley colonies to degrees 
that are statistically enormous. Comparing the Tereehia shells with those of 
