236 
TaBLe 181.—Partula otaheitana sintstrorsa. 
Series. 
apex, sinistral 
cestata, sinistral . 
phea, sinistral 
All, sinistral 
apex, dextral 
cestata, dextral 
* phea, dextral 
All, dextral 
TasiLe 182.—Partula otaheitana sinistrorsa. 
VARIATION, DISTRIBUTION, AND EVOLUTION OF THE GENUS PARTULA. 
Maara Valley. Fecundity. 
No. of | Per cent | No. of | No. of Total Average | Average 
Records. ; ; , 
gravid.| gravid. | eggs. | young. | contents. | for gravid. | for all. 
7 6 85.7 6 5 11 1.83 Se 
76 71 93.4 104 63 167 BBS 2.20 
50 44 88.0 60 33 93 7 itil 1.86 
133 121 91.0 170 101 272 2) PS) 2.04 
5 3 60.0 2 6 8 2.67 1.60 
36 34 94.4 40 34 74 2.17 2.05 
29 25 86.2 29 22 51 2.04 1.76 
70 62 88.5 71 62 133 2.14 1.90 
Maara Valley. 
Fu Statistics oF HEREDITY. 
Young, sinistral. Young, dextral. 
Total. 
Plain. | Banded. Ege- Mitta, || Bevadtea|| PEE 
young. young. 
apexasinistralerrrrrierere 3 AG Lanne (1) 4 (5) 
phea, sinistral........ 14 3 (4) (3) 26 (33) 
cestata, sinistral....... 9 32 (14) 5 (2) 47 (63) 
apex, Gextrallriemieiiiers 3 (3) Ne ets 3 (6) 
Dheandextraleeerraeeier 11 1 (2) (4) 16 (22) 
cestata, dextral....... 1 7 (4) 14 (5) 25 (34) 
AGRA Me teed tech bent heals 41 43 (27) 18 19 (15) 121 (163) 
Summary. Herepiry oF Com. Summary. HeErReEpiTy oF CoLor-PaTTERN. 
Young, | Young, Young, | Young, 
sinistral.} dextral. aeuel plain. | cestata. weve 
Adults: Adults: 
Sinistral eerie 79 22 101 a AMER oso 
Dextral......... 17 47 @ || PB ene \ = 2 2 
cestata ... 14 58 72 
Totaleeene cance 96 69 163 
Total okt ieee 59 62 121 
recalled. 
VAIHIRIA AND VAIRAHARAHA VALLEYS. 
The topographical relations of these two valleys have been explained at an 
earlier point in the discussion of Partula clara, but certain features need to be 
In effect, Vaihiria and Vairaharaha are sister parts of one great valley, 
which is divided by a long mountain spur down its center. 
The outward portions 
of the two are confluent some little distance before the coastal plain is reached. 
Each element, however, has a long and straight course and is independent of the 
other throughout most of itslength. So far as P. clara is concerned, as we have seen, 
the two colonies are really separate. 
The same is true for P. otaheitana sinistrorsa, 
for snails are not taken coastward of the dividing ridge; yet the simzstrorsa associa- 
tions are very similar in most respects and are dually different from the Maara and 
eastward series. 
For the sake of condensation, they will be considered together. 
