PARTULA OTAHEITANA. 221 
Even in advance of the detailed analysis of this series, certain points of the 
foregoing quotation must be discussed. Pease’s sinistrorsa is not now confined to 
Tahiti nui, as four valleys of Taiarapu are inhabited by it; it displays more types 
of coloration than are enumerated. Furthermore, sinistrorsa is not invariably 
reversed; that Garrett makes his categorical statement is very important as indi- 
cating a situation in his time which has materially changed since. ‘There is little 
chance of confusing P. producta with dextral sports from the reversed sinzstrorsa 
stock, because the details of fasciation differ distinctly and other diverse qualities 
of the two kinds are readily found. Finally, sznistrorsa does not present identical 
features in the valleys of its range, save in the most general way; in color composi- 
tion of the colonies and in details of size and form, considerable diversity exists. 
Comment on the statements relating to simistralis and crassa may be deferred 
until those divisions are met in the regular order of description. 
Tasie 161.—Partula otaheitana sinistrorsa. Census of the variety. 
Number in adult population. Per cent of adult population. 
Total 
Valley. No. of Sinistral. Dextral. Sinistral. Dextral. 
adults. 
apex. | cestata. | phea. | apex. | cestata. | phaa. | apex. | cestata. | phaa. | apex. | cestata. | phea. 
WENBENELS Soc 139 56 78 5 4. Hts oc 40.3 | 56.1 3.6 ae =o a: 
Aiavaro..... 170 37 133 yer ae Aone biz 21.8 78.2 Pees ead te Sats 
WEN oc0000 219 6 RO 219 weet Bc Mee aoe ooo | 1) Boe a'0 oc 
Vaipoe...... 190 14 176 08 510 500 aus 7.3 92.6 AGO FG Stare 
Haoma..... 0 S00 Wt chs oe ete Dod 60008 ator Meas) a iv oar 
OLYNRs socooc 0 eke cased ais ot Bee save esis Sites Stk |i be He syonats 
Apirimaue... 284 16 264 4 ate whens ines 5.6 92.9 1044 eee BE Loe 
phitavirineerr 245 27 115 26 10 15 62 11.0 46.9 10.6 ay 6.1 DONS 
Tenaire..... 907 193 109 72 51 124 358 Pil 8} 12.0 8.0 5.6 13.6 39.4 
Maara...... 203 7 76 50 5 36 29 3.4 37.4 24.6 D8) 7 o0 14.3 
Vaihiria..... 303 Soo 277 26 ot SOc weet Soe 91.4 8.6 5 Sook aYoroS 
Vairaharaha. 247 200 52 195 D0 oe sees DiO.OID 21.0 78.9 ae 
Faarahi..... 467 000 165 300 a 1 1 S008 Si5) 56) 64.2 0.2 0.2 
Moaroa..... 434 500 171 263 a6 oi ae Boe 39.4 60.6 ee 
Taharua.... 325 0° 115 207 ate 3 ares tae 35.4 63.6 0.9 
MotalGeyryrer 4,133 350 | 1,950 1,148 56 179 450 8.5 47.2 27.8 i168 4.3 10.9 
1One adolescent. 
The absolute and relative members of sinistrorsa in the otaheitana populations 
of its range have been given at an earlier point. ‘Three subordinate color-types are 
specified in the following description as apex, cestata, and phea; their absolute and 
relative abundance in both the sinistral adult group and in the dextral adult group. 
when this is represented, are given in table 161. ‘The details will be treated in 
serial order. 
It remains only to state that the range of sinistrorsa is divided into two geo- 
graphical regions, viz, the southern and western part of Taiarapu, and the southern 
valleys of Tahiti nui to and including Taharua. In the isthmus of Taravao sinis- 
trorsa does not appear, nor in the adjacent valleys of Haoma in Taiarapu and Oopu 
in Tahiti nui; a single immature specimen was taken in Faone Valley, the southern- 
most habitable area of Partule in the eastern quadrant. 
