PARTULA HYALINA. 47 
degree, although implicit reliance upon their final value must be withheld. Table 
14 gives the figures for five valleys of the northern quadrant, four of the west, two 
of the southern region, two of the east, and four of Taiarapu. Were the individuals 
of the several colonies sufficiently numerous, it would be worth while to make a close 
comparison, valley by valley, of the whole population, a task which will be under- 
taken for other species of Tahiti. Under the circumstances, however, only a few 
of the general results may be derived from the recorded numerical data. In each 
quadrant some of the colonies vary in one direction in a given character, while others 
depart in the opposite way for the regional average, as defined in the previous table. 
The shells of Taiarapu are by far the most illustrative of this point; those of Vavii 
TaBLeE 14.—Partula hyalina. Tahiti. Statistical description of representative colonies. 
Mean VALUE. 
Shell. Aperture. Length aper- 
ture + length 
Valley. No. Shelltproe 
Length. Width. Proportions. Length. Width. Proportions. portions. 
mm. mm. p. ct. mm. mm. Dp. ct. p. ct. 
Papenoo....| 34 | 14.7500+.0906 8.3824 0446 §$6.7353 + .1841| 8.4588 .0545) 6.1294 .0400) 72.3824 .2409| 57.3235+.1973 
Tuauru....| 12 | 14.9500+.0993) 8.6000 .0539) 57.5833 .3415| 8.7167 +=.0919| 6.4166 .0719) 73.9166 .3022) 58.0833+.4799 
Riraieeeeier 37 | 15.2527+.0679} 8.9000 .0455) 58.0676=.2165) 8.9892 .0446) 6.5622 .0421) 72.9054 .2284) 58.8243+=.2158 
Fautaua....| 93 | 15.2436+.0508] 8.8720 .0273) 58.1344=.1170) 8.8710 .0312) 6.5376 .0249) 73.6505 .1465} 58.2312=+.1240 
Tipaerui....| 16 | 15.5000+.1012) 8.6250+.0570) 55.6250+.3090| 8.9500+.0768) 6.4750+.0629 72.6250+.3090) 57.2500+.3501 
Taapuna...| 12 | 15.4500+.1774| 8.6334+.1009| 59.1666 .3309| 8.9500 .1283| 6.5833+.0999| 73.1666 .2295| 57.8333 + .3309 
Maruapoo. . 9 | 15.1167 .1004) 8.8333 .0948) 58.0555+.6280) 8.8222+.0820) 6.5777+.0747| 74.3888+ .6740) 57.8333 + .3821 
Atehi...... 11 | 15.3227+.1570} 8.8636+.1108) 58.0454 .6093) 9.0000 .1451) 6.8909 .0955) 76.5909 = .5939| 58.9545 =.5229 
Aoua 19 | 14.6711+.0766| 8.4369 .0532) 57.3947 + .2063| 8.4211 .0530| 6.3579+ .0444| 75.2895 .2909| 57.4474 .1625 
Otuna......| 18 | 15.0934 .1209 8.5778 = .0562) 56.9445 = .2815| 8.9777 + .0542| 6.5888+ .0631) 73.1666 .3555|) 59.1666 .2702 
Tenaire.... 7 | 15.9071=.2020) 8.9571=.1009 56.0714 .2303| 8.9714+ .0961| 6.6286+.0635) 73.5000 .1927| 56.2143 + .3257 
Paraura....| 21 | 15.5786.1218 8.6905 -+.0645. 55.5475 = .2337| 8.9619 + .0486) 6.4286+.0355) 71.4524 .3029| 57.5000+.2081 
Faarumai...| 10 | 14.9600+.1181| 8.4400=+.0662) 56.2000+.3171| 8.6400+.0533| 6.3800+.0554| 71.5000 .3016|) 57.8000 .1919 
Tehoro..... 9 | 15.9166+.1572) 8.7000+.0734| 54.6112+.1657| 9.1333 .0948) 6.6222 .0651) 71.9445 .2620) 57.1667 = .3294 
Haavini....| 20 | 15.2150+.0875| 8.7900 .0387) 57.6500+.2624| 9.0000 .0477) 6.5400 .0383) 72.5500 .2545| 58.9500+.2210 
Tautira....| 17 | 14.8735+.1226) 8.5588 .0535| 57.6176+.3168) 8.9882 .0748) 6.3177 .0573] 72.1471+.1678] 58.9118 .2513 
Werntls oooos 21 | 16.0500+.0844) 9.0047 + .0432) 55.8810 .3314| 9.3333+.0605| 6.7047 + .0564| 72.1191 .2153| 57.9285 .1849 
STANDARD DeyiaTION. 
Papenoo....| 34 0.7836 .0640) 0.3854 .0315) 1.5915 .1302) 0.4716+.0385) 0.3460+.0283| 2.0830.1703) 1.7058+.1395 
Tuauru....| 12 -5099=+.0702| .2769=.0381| 1.7539+.2415| .4723+=.0650! .3693+.0508) 1.5524+.2137| 2.4650+.3393 
IDEM Go po000 37 -6122+.0480} .4106=.0322) 1.9526.1531| .4025+.0315|) .3801+.0298) 2.0597+.1615) 1.9459+.1526 
Fautaua....| 93 .7264 .0359| .3909=.0193) 1.6728+.0827| .4463+.0220) .3568+.0176| 2.0942+.1036| 1.7728=.0877 
Tipaerui....| 16 -6000+.0715| .3382+.0403) 1.8328+.2185) .4555+.0543) .3733+.0445| 1.8328=+.2185| 2.0766+.2475 
Taapuna...| 12 -9110=.1254) .5185=+=.0713) 1.6996+.2340) .6589=.0907) .5129+=.0706) 1.1785+=.1623) 1.6996+.2340 
Maruapoo. . 9 4467=+.0710| .4216+.0670) 2.7933+.4440| .3646+.0580) .3325+=.0528) 2.9979+.4766| 1.6996=.2702 
Atehi...... 11 .7723.1110) .5449=.0783) 2.9959+=.4308| .7135+.1026| .4699+.0675| 2.9203+.4199) 2.5713=.3697 
ANNES o10.0 00 19 4948+ .0541) .3437+.0376| 1.3336.1459| .3428+.0375| .2871+.0314) 1.8800=.2057| 1.0500+.1149 
Otunaseeeee | eLs .7542=.0855| .3536.0397| 1.7708+.1990| .4211+.0382| .3970+.0446| 2.2361+=.2514| 1.6996+.1910 
Tenaire.... 7 .7926=.1428| .3959=.0713} 0.9034.1628] .3769+.0679) .2490+.0449 .1559 = .1362| 1.2777 .2303 
LPEWITL o 5 oll Bil .8276=.0861| .4385+.0456} 1.5878+.1652| .3302+.0344| .2413+.0251) 2.0581+=.2142) 1.4142+.1471 
Faarumai..| 10 -5539+.0835| .3105+.0468) 1.4866 .2242) .2498+.0377| .2600=.0392| 1.4142+.2133 -9000 = .1357 
Tehoro..... 9 -6992+.1111} .3266+.0519 7372+ .1172| .4216+.0670) .2897+.0460) 1.1653=.1852) 1.0541+.2329 
Haavini....| 20 .5803+.0619} .2567.0274| 1.7399+.1855| .3162+.0337| .2538+.0271) 1.6874.1799| 1.4654 .1563 
VEAL og ol] ie .7495= .0867| .3273=.0378| 1.9367+.2240| .4574+.0529| .3502+.0405| 1.0256+.1186) 1.5361.1777 
Wiaviitrve rye 21 .5732+.0597| .2936+.0305| 2.2514+.2343) .4109+.0428) .3836+.0399| 1.4631+.1522) 1.2563+.1307 
