2X2 VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
Taste 154.—Partula otaheitana affinis. Southern Taiarapu Series. 
FECUNDITY. Herepity (Varaaia VALLEY). 
Nowce Per INGHORIINGWOE Total | Average Nveraze Young,| Young, Young, Young, 
Records. eta cent Seven | ean cols for aril dex., dex., sin., sin., | Total. 
8 ‘gravid. BBS. 1 8+ tents. gravid. : plain. |banded.| plain. |banded. 
Hototunu, d.... 44 37 84.0 42 28 70 1.89 1.59 Adults: 
Vaiaaia, d. ands. 6 4 66.6 4 4 8 2.00 1.33 D., plain.... 1 1 
Weratl, Glsccoaccce 6 2 338) 2 0 2 1.00 OSS) D., banded.. 1 
aomaycerrearier 44 40 90.9 59 30 89 2.22 2.02 Ss iplainseee 1 
THE PAPEARI COLONIES—OOPU AND APIRIMAUE VALLEYS. 
Having completed the circuit of Taiarapu, we return to Papeari, the south- 
eastern district of Tahiti nui, where affinis is found in two valleys of a region that 
articulates both with the peninsula and with the eastern series of valleys ending at 
Faone. 
class (plate 30, fig. 8). 
fig. 9), where sinistrorsa thrives in great abundance. 
TasLe 155.—Partula otaheitana affinis. 
Mean VALUE. 
Oopu and Apirimaue Valleys. 
In Oopu, 36 affinis were taken, of which 3 belonged to the zonata color- 
Six plain shells only were collected in Apirimaue (plate 30, 
Shell. Aperture. Length aper- 
Series. No. | aig nie Tooth, index. 
Length. Width. Proportions. Length. Width. Proportions. tions. 
mm. mm. 72s Go mm. mm. p. ct. p. ct. 
Oopu, plain. .| 33 | 16.7318+.0827| 9.8636+.0482) 58.8030 .2211] 8.8697 + .0549| 6.7363 .0344| 75.9849 .2619| 52.8333+.1826| 2.3940+.1291 
banded| 3 | 17.0500+.1101] 9.4334 .1324) 59.8333 .3676| 9.1000+ .0640} 6.7666+.0367| 74.5000 .6359| 53.1666 .3676| 2.6667=+.1836 
Oopu, all....| 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 
STANDARD DEVIATION. 
Oopu, plain. .| 33 0.7043+.0585| 0.4103 .0341| 1.8827+.1563} 0.4674+ .0388) 0.2932+ .0243) 2.2309.1852] 1.5555+.1298) 1.0993+.0913 
banded| 3 .2828+ .0778 -3399 = .0936 -9428+ .2599} .1633+.0452) .0942+.0259) 1.6329 .4496 -9428=.2599| .4714.1294 
Oopu, all....| 36 6849+ .0544| .4220+.0335| 1.8451=.1467| .4533+.0361) .2821+.0224) 2.2207+.1765| 1.2282+.0976| 1.0639 .0846 
Apirimaue...} 6 .4582+.0892| .4229+.0823) 2.1344+.4156} .2924+.0570} .2516+.0490) 1.5271+.2973] 1.3478+.2624| .4714+.0918 
In dimensional respects the statistics (table 155) show that the Oopu shells 
resemble the Haoma series more than the Faone colony. The Apirimaue specimens 
are collectively larger than any others except the far-distant Farapa colony. 
view of the fact that dextral examples of the large sinistrorsa type occur in Titaviri 
and other valleys immediately to the west, it might be supposed that some such 
shells were included in the so-called affinis series. 
of the specimens in question are those of affinis. 
In 
But the differential characters 
Again, their variability is low, as 
it would not be if some of the so-called afinis shells were dextral sports from the 
larger sinistrorsa stock. Finally, all of their young were dextral, and all of the 
young of the associated series (169 in all) were sinistral like their own parents. 
