PARTULA OTAHEITANA. 217 
Ill. The dimensional characters of the shells vary from valley to valley, without 
any consistent relation to geographical or other external conditions. ‘The pertinent 
data are presented in summary numerical form (tables 157 and 158) and in graphic 
diagrams (table 159), so that the degree, relation, and direction of changes noted in 
passing from one area to another may be readily comprehended. It is unnecessary 
to supplement the tabulations by verbal statements. 
TasieE 157.—Partula otaheitana affinis. Statistical summary, dextral representatives. Mean value. 
Shell. Aperture. | Length aper- 
Valley. | No. eat eee Tooth, index. 
Length. Width. Proportions. Length. Width. Proportions. tions. | 
mm. mm. p. ct. mm. min. Dp. ct. Dp. ct. 
Tuauru...| 354) 17.3814+.0282 10.3232 .0153) 59.3220+.0759| 9.3181+.0169| 7.3091 .0125) 78.3870 .0936 53.4944 .0671) 2.8650+.0249 
Ahonu....| 143} 17.0136 .0469} 10.0608==.0277) 59.0105 .1114) 9.0147 + .0297) 6.9308 .0227| 76.7727 .1406 52.8217+.1077) 2.4759+ .0756 
Faaripoo..| 308) 16.7263+.0276| 9.8987+.0160) 59.0617+ .0764| 8.9701+.0167| 6.8149 .0129) 75.8312 .1015) 53.5130+.0710) 2.0839 .0429 
Papenoo. .| 147] 16.6235=+.0462) 9.6986+.0242) 58.2143+.1266) 8.9109+.0242| 6.6442 .0205) 74.3299+ .1558) 53.4864+.1034| 1.5164 .0507 
Farapa...) 582) 17.8227+.0265) 10.2945+ .0122) 57.7423+ .0632) 9.4185 .0133| 7.2172+.0094| 76.5638 .0744 52.7320 .0485| 1.1439+ .0123 
Faarumai.| 313) 15.5388+.0245) 9.2668+.0132) 59.5767 .0748) 8.1741 .0142) 6.4163 .0107| 78.4041+.0907 52.5191 .0713| 2.4154+.0341 
Tiarei....) 151) 16.2222+.0377| 9.3013+.0200| 57.1424 .1104| 8.3675+.0211| 6.3662 .0174| 76.0364 .1316) 51.4404 .0903) 2.4702+.0459 
Mahaena.| 137) 16.6989+.0414) 9.6985 .0204| 58.0620 .1249) 8.7555 .0227) 6.8314 .0176 77.9818 .1341| 52.3540+.1055) 3.0073 .0459 
Vahii.....| 407) 16.6546+.0245) 9.9285+.0128) 59.4803+.0659) 9.0091 + .0140) 6.9708+.0106 77.3256 + .0780) 53.9545 + .0569| 2.3793 = .0420 
Paraura...| 573) 16.3071-=.0206, 9.6578 .0106, 59.1230+.0619) 8.6557 .0118) 6.6742 .0090| 77.0113+.0654) 52.9538 .0505) 2.0000-+.0255 
Faatautia.| 12) 16.1750+.1171| 9.3667+.0331) 57.9167+.4011) 8.2333+.0507) 6.6334+ .0331) 79.4166+ .4733) 50.7500+.1799| 3.4166+.1655 
Papeiha. .| 162) 16.8463 .0356 9.7852 .0195) 58.0247 .1114| 9.0086 .0222) 6.7358 .0165 74.6667 + 1344) 53.3457 + .0963) 2.7117 +.0527 
Utuufai.. .| 338) 16.6645 .0278) 9.7970+.0141) 58.6893+.0778) 8.7911+.0151) 6.7189 .0120| 76.3491 .0888) 52.6124+ .0596) 3.2843=+ .0339 
Faone....| 587] 16.4892+.0207| 9.6997+.0110| 58.7334 .0582| 8.6792+.0113) 6.6693 .0087| 76.7743 + .0645| 52.5290+.0479| 3.1271 .0286 
® |. 
Tehoro...) 303) 16.0382 .0259) 9.4201+.0128) 58.7013+.0828) 8.4802+.0137| 6.4604+ .0096| 76.0776=+ .0904) 52.8201+.0713) 3.3049 + .0330 
Haavini..| 56) 15.6821+.0664) 9.3215+=.0338) 59.3571+.1968) 8.4250+.0395) 6.3500+ .0288) 74.3750+.1763) 53.5357+.1762| 1.8750+.0703 
Tautira...) 205) 15.9880+.0374) 9.3098+.0190) 58.3049+.1088) 8.3644+ .0191) 6.2756+.0148 74.9342 = .1031| 52.1976 .0817) 1.1933 = .0262 
Aionifaa..| 14) 16.0143+.0984) 9.2149 .0575) 57.2858+.2064, 8.3286+.0744| 6.2000+.0447| 74.2143+ .3436) 51.7857+.2925) 1.0714+.0464 
Aiurua...} 100) 15.5810+.0436) 9.1100+.0217 58.3500 + 1472) 8.1820+ .0227| 5.9780+.0161| 72.9500+.1448) 52.3600+.1129) 1.0400+.0016 
Vaiau....| 11) 15.5408+.1383) 9.0273+.0834| 58.0455+.3613) 7.9909+.0903) 6.1909+ .0437 77.3181 + .5333| 51.4091 .2796) 3.0909 + .2203 
Hototunu.| 45) 16.4500+.0744| 9.6378+.0434) 58.5666+.1982) 8.6067+.0446| 6.3667 +.0303) 73.9000+.2448| 52.2111+.1691) 1.0217+.0144 
Vaiaaia...| 5) 16.3700+.2896 9.7000.1790) 58.9000 .6497| 8.7000 = .1663| 6.5000 .1207| 74.5000 + .5406} 52.9000 .1478) 1.6000 .2413 
Wavii.....| 6 15.9500+.2979| 9.2000+.0885) 58.0000+ .5379| 8.2000+.0993) 6.0667 + .1120) 74.1667 .3785| 51.5000+.3555| 1.5000+.2103 
Vaipoe.. -| 69) 16.5457 .0643) 9.5580 .0351) 57.6014 .1829) 8.7811+.0355| 6.3406 .0263) 72.1812 .2080) 52.9348 .1603) 2.1884 .0866 
Haoma...| 44| 16.8432+.0790) 10.1273+.0413) 60.0909 .2160) 8.8409 .0510) 6.9636+ .0371) 78.5909 .3140) 52.5227+.1908) 3.3181+.0711 
Oopu.....| 36) 16.7583+.0770| 9.8278+.0474) 58.8889 .2074| 8.8889 .0510) 6.7389 .0317| 75.8445 + .2496| 52.8611 .1381) 2.4167+.1197 
Apirimaue. 6 17.7500 .1262| 10.1333+.1164) 57.1667 +.5877) 9.0667 +.0805| 6.8000+ .0693) 74.5000+ .4205|) 51.0000+.3711] 1.6667 + .1298 
| 
IV. Mutations of several kinds have arisen in certain areas. 
Sinistral individuals 
were found by Garrett only in Papenoo, while in my experience they now occur in 
seven valleys. Banded types were described by Garrett for a restricted locality, 
whereas they are now to be found in twenty separated regions, in which they prove 
to be closely related to their plain associates. In Farapa a red-banded form exists, 
and in northeast Taiarapu an entirely new bicolored pattern is exhibited by some 
of the shells. A giant adolescent was discovered in Paraura. In all of these cases, 
the significant point is that the mutants, for such these seem to be, have appeared 
in the old and long-occupied territory, in which environmental changes of a causative 
nature would not be likely to occur. 
V. A Mendelian order of inheritance seems probable in the case of the alternative 
plain and banded forms of coloration, the former being dominant to the latter. The 
facts as observed and interpreted lead to this conclusion, although the difficulties 
in the way of final proof are such as to render the statement tentative only. 
