PARTULA CLARA. 67 
Tiamao, its neighbor to the west, it appears that the former differ from the latter 
to the extent of 7.7024 per cent, which difference has a probable error of only 0.5623 
per cent. Making the same comparison with clara as it exists in Otuna Valley, 
next to Tereehia on the east, the difference is 7.2739 per cent with a probable error 
of 0.4600. In short, the differences in question are more than 13 and 15 times their 
probable errors. Great emphasis must be put upon the fact that the diagnostic 
character of this variety is a proportionate one and not an absolute dimension such 
as total length; conceivably it is less subject, therefore, to modification by factors 
which might affect the extent of growth. It isa matter of unique and specific form. 
Partula clara prima var. nov.—Maruia to Vaihiria Valleys. 
It has been noted above that an abrupt change in the character of the clara 
shells takes place upon passing beyond Tereehia Valley. Afterwards, for many 
miles, the species presents essentially the same characteristics as far as the ridge to 
the eastward of Vaihiria Valley, beyond which the color characters are distinctly 
different. This extensive region between and including Maruia and Vaihiria 
Valleys covers the greater part of the original habitat of clara. For this and other 
reasons the variety occurring in the specified sector is distinguished as prima (figs. 
5 to 23, plate 21, and table 25). 
TaBLeE 25.—Partula clara prima. Statistical description of shell characters, by valleys. Mean value. 
Shell. Aperture. Length aper- 
ture + length 
Valley. No. eheitoros 
Length. Width. Proportions. Length. Width. Proportions. portions. 
mm. mm. p. ct. mm. mm. p. ct. PD. ct. 
OW. coccsoocn 9 | 15.4833 .0959| 9.0556 .0842) 58.2778 .2955| 8.6334+.0874) 6.4778 +.0616) 75.1667 +.1835| 55.9444 + .4384 
Opitiroasee eee 6 | 15.3500+.0953) 8.7333 =.0587| 57.0000 +.3812| 8.3333+.0378| 6.3333+.0205| 75.3334+.1892| 54.6666+ .2938 
Memarnuaenrey sc. 5 | 14.8100+.1054) 8.5800+.0614) 57.5000+.3302| 8.4600+.0703| 6.1800+.0482) 72.7000+.2255) 57.4600+.3919 
Rapeitineernen: 9 | 14.6166+.0719| 8.5000+.0561) 58.1667 +.1498) 8.3000+.0971| 6.2333+.0670) 75.0555+.5624) 56.3889 = .3885 
WEEN ocoacc00s 31 | 15.2629=.0811| 9.0226+.0419) 58.9194 .2914) 8.7516 .0430) 6.4807 .0366) 73.7580 .2196| 57.3710+.2660 
Moaroake ec... 25 | 15.6500+.0715| 9.1480 .0291) 58.2600+.2595| 8.9800+.0463) 6.6440+.0259) 73.7400 .2329)| 57.1000+.1619 
Faarahi—all ... . 9 | 15.6833+.1249) 8.9222+.0578) 56.8333+.3514| 8.7222+.0684| 6.5222+.0515} 74.5000+.3179| 55.6111+.1273 
bands . 2 | 15.5000+.2146) 8.8000+.0477| 56.5000+.9538) 8.8000+.1430) 6.6000+.0477) 74.5000+.4769) 56.5000+.0 
Vairaharaha— 
Gankeyinente en 94 | 14.7163+.0312) 8.8350+.0160} 60.0125+.0931| 8.2875+.0551| 6.3725+.0122| 76.9625+.0997) 56.1438 .0601 
Vaihiria—light..| 36 | 15.3167=+.0728) 8.9722 .0336) 58.5277 .2256| 8.6556+.0468| 6.5722+.0336) 74.1111 .2433) 56.3056 .2014 
dark..} 12 | 15.3000+.0887) 9.0500+ .0453| 58.9166 .2443) 9.0166+.0462| 6.6000+.0337| 73.4167 +.2444| 58.8333+.2295 
bands.| 27 | 15.0611+.0768) 8.8703+.0398) 58.9074 .2127| 8.6182+.0470| 6.3963+.0356| 74.1667 =+.2120| 57.0555+.1706 
all....) 75 | 15.2220+.0440) 8.9720+.0229| 58.7200+.1166| 8.7000+.0311) 6.4440+.0220) 74.0200+.1464!| 56.9800+.1384 
Whole region... .} 255 | 15.1206+.0263| 8.9227+.0131| 58.9431+.0792| 8.5808+.0173| 6.4349 .0109| 74.9431 .0933| 56.6216+.0666 
Of 306 adult individuals, 125 are light and plain, 135 are dark and plain, while 
46 are banded in various ways. The members of the first and second classes have 
more or less well-marked darker streaks upon the general corneous ground-color, as 
in incrassa, minor, and angusta. ‘The banded shells are entirely different from those 
described earlier. Sometimes all three classes are represented in a valley population, 
but in other cases the collections comprise two color-classes, or only one. It is 
necessary to describe the facts valley by valley, omitting those in which very few 
specimens were secured. 
