110 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
With the male Labidocerse the case is quite different. First of all, they can be 
divided into two classes — those that are found at the surface with the females and 
those that are scattered through the water. Individuals from both these classes were 
subjected to experiments such as have been already described for the females. Table 
3 shows the distribution at five-minute intervals of five males taken from the class of 
scattered individuals and open to the action of both light and gravity, as in the first 
experiment with the females (Table 1). 
Table 3. 
Five-minute 
intervals. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Totals. 
V 
2 
1 
1 
0 
1 
1 
i 
1 
0 
0 
8 
o ai 
□0,0 
IV 
1 
1 
2 
2 
0 
1 
0 
1 
1 
1 
10 
G 3 
O 
III 
0 
1 
0 
2 
2 
1 
2 
0 
1 
1 
10 
II 
2 
2 
1 
0 
i 
0 
0 
2 
2 
1 
11 
I 
0 
0 
1 
1 
1 
2 
2 
i 
1 
2 
11 
The distribution as shown in this table indicates almost complete indifference, as 
might have been expected from the previous distribution of these animals in the water. 
Table 1 shows the results from the same five males when the tube was placed in the 
dark, as in the second experiment with the females (Table 2). 
Table -1. 
Five-minute 
intervals. 
1 
2 
3 
4 
5 
6 
. 
7 
8 
9 
10 
Totals. 
V 
o 
i 
1 
2 
i 
1 
i 
1 
2 
1 
11 
O 6 
IV 
2 
1 
1 
0 
2 
1 
i 
2 
0 
1 
11 
G 3 
o-G-j 
III 
l 
2 
1 
1 
0 
1 
2 
0 
1 
0 
9 
f* 0) 
O ri 
II 
1 
0 
1 
9 
1 
0 
1 
1 
1 
1 
9 
zn 
I 
l 
i 
1 
0 
1 
2 
0 
1 
1 
9 
10 
The results shown in this table are so nearly like those in Table 3 that it is safe 
to assume that light plays no important part in the distribution of this class of males. 
The second class of males, those found at the surface with the females, might 
naturally be expected to show the same reactions to light, gravity, etc., that the females 
do. This, however, is far from the case. Table 5 gives the distribution of five males 
taken from among the females at the top of the water, and placed by themselves in a 
glass exposed to diffuse daylight, as in the first experiment with the females. 
Table 5. 
Five-minute 
intervals. 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
Totals. 
V 
1 
1 
0 
1 
0 
1 
1 
1 
2 
1 
9 
° 
IV 
2 
1 
1 
1 
1 
0 
1 
1 
i 
2 
u 
Js 
III 
0 
0 
2 
1 
2 
2 
1 
0 
1 
0 
9 
O r- 
(L> T". 
Z/j 
II 
I 
1 
1 
2 
1 
1 
1 
2 
0 
2 
0 
2 
0 
0 
2 
0 
3 
1 
0 
0 
2 
11 
10 
