140 
PACIFIC SCIENCE, Vol. XVIII, April 1964 
TABLE 1 
Distribution of Males and Females in 24 Groups of 10 Animals 
Each Collected on 1 July 1961 
FREQUENCY 
MEAN WT. 
DISTANCE 
CONTINUOUS 
ROCK 
NO 
OF SAMPLE 
A TO B 
OR 
NO. 
SAMPLE 
$ 
$ 
GONADS 
IN GRAMS 
IN FEET 
DISCONTINUOUS 
1 
a 
— 
10 
_ 
1.09 
7 
Disc. 
b 
4 
- 
6 
0.73 
2 
a 
- 
10 
- 
1.33 
3 
Disc. 
b 
- 
10 
- 
0.91 
3 
a 
— 
6 
4 
0.92 
2.5 
Disc. 
b 
1 
- 
9 
0.80 
4 
a 
- 
10 
_ 
0.77 
3 
Disc. 
b 
- 
7 
3 
0.72 
5 
a 
_ 
_ 
10 
0.44 
12 
Disc. 
b 
- 
3 
7 
1.53 
6 
a 
- 
10 
- 
1.18 
4 
Cent. 
b 
- 
10 
- 
0.61 
7 
a 
- 
5 
5 
3.11 
6 
Disc. 
b 
- 
1 
9 
0.47 
8 
a 
_ 
5 
5 
2.10 
4 
Disc. 
b 
- 
7 
3 
2.06 
9 
a 
— 
4 
6 
0.91 
2 
Cent. 
b 
- 
4 
6 
1.25 
10 
a 
_ 
_ 
10 
0.89 
1.3 
Disc. 
b 
9 
- 
1 
3.19 
11 
a 
7 
- 
3 
2.37 
4 
Disc. 
b 
4 
- 
6 
0.77 
12 
a 
8 
- 
2 
2.89 
12 
Cent. 
b 
5 
- 
5 
2.81 
Total of 
Individuals 
Per cent of 
38 
102 
100 
Individuals 
15.8 
42.5 
41.7 
Number of 
Samples of 10 
Per cent of 
7 
15 
2 
Samples 
29.2 
62.5 
8.3 
very large gonads), thus delaying this study 
until the following summer. When the animals 
collected in I960 for the study of the gonad 
cycle were all dissected, the observed sex ratio 
was L8 females to 1 male. Thus it was suggested 
not only that the sex ratio might be other than 
1 : 1 , but that males and females might not be 
distributed at random within the aggregations, 
or in the population as a whole. 
The data from the collection of the 240 ani- 
mals taken on July 1, 1961, shown in Table 1, 
suggest the reason for the observed sex ratios. 
The rocks, numbered 1 to 12, were selected in a 
generally north to south sequence over the area 
from which animals had previously been col- 
lected for the study of the gonad cycle, thus 
including many of the same aggregations pre- 
viously sampled. 
