PARTULA OTAHEITANA. 231 
faint. In no case, however, did banded young-appear (table 175); all were plain, 
and either light horny-brown or dark brown in color. Whether or not these two 
divisions correspond with apex and phea can not be determined. Either the pre- 
servative had affected the colors and patterns in the case of this collection, or else 
the distinctive color-class characters are not developed until post-embryonic life. 
From the facts as observed in contiguous valleys, the latter is indicated as the cor- 
rect interpretation, which agrees, furthermore, with the results in the case of the 
Vaipoe association. 
TasBLe 174.—Partula otahettana sinistrorsa. Tuitavirt Valley. Fecundity. 
y y 
No. of | Per cent | No. of | No. of Total Average | Average 
Series’ INSEE: gravid.| gravid. | eggs. | young. | contents. | for gravid. | for all. 
apexsisinistrallrerrerteict: 22 17 OU oD 21 14 35 2.05 1.59 
cestata, sinistral....... 106 83 78.3 84 47 131 1.57 1.23 
phea, sinistral......... 20 18 90.0 16 21 37 2.05 1.85 
AI Msinistralleerrterie 148 118 79.7 121 82 203 Ly/i2, 1.37 
cestata, dextral........ 14 12 85.7 14 2 16 1.33 1.14 
phea, dextral......... 54 38 70.3 32 23 55 1.44 1.01 
Allidextralirmmrriecice 68 50 73.5 46 25 71 1.42 1.04 
In the case of the heredity of the coil, there can be no question as to the correct- 
ness of the observations. “Table 175 and its summary give the proof that in a few 
instances at least an adult of one kind may bear young of the contrasted form of 
spiral. If two or more young are present in the brood pouch they are of the same 
mode, whether or not this agrees with the parental direction of spirality. The total 
numbers of reversed and direct young agree closely with those for gravid parents. 
TasLe 175.—Partula otaheitana sinistrorsa. Heredity. Tuitaviri Valley. 
Fu.t Srartistics. SUMMARY. 
Young, sinistral. | Young, dextral. 
Light | Dark | Light | Dark | Total. ous Pore: Total. 
brown, | brown, | brown, | brown SEEM | CoreTeN 
plain. plain. plain. plain. 
Adults: Adults: 
apex, sinistral...... 11 3 Boa A es 14 Sinistral.... 78 4 82 
cestata, sinistral... 9 37 1 tee 47 Dextral.... 1 24 25 
phea, sinistral..... 6 12 1 2, 21 ae ee 
cestata, dextral.... 1 Antve Pete 1 2, Motaliae. 79 28 107 
phea, dextral...... ats Bas 11 12 23 
Motaltacneeeeeeces 27 52 13 15 107 
TENAIRE VALLEY. 
Among the colonies of true sinistrorsa that of Tenaire Valley is in many ways 
the most interesting and valuable. While it is exceedingly complex, there is an 
abundance of material in hand for its analysis; 555 adults and 79 adolescents were 
taken in 1907, and in 1909 a series of 352 full-grown and 69 immature snails was 
secured. In the latter year more attention was paid to other species of the genus, 
