VARIATION IN ECHINOID PLUTEI 
705 
V. Right Oral Arm, 2 Days 
S5 
8 
9 
10 
11 
12 
13 
14 
15 
7 
1 
1 
8 
1 
1 
1 
3 
9 
0 
10 
1 
1 
11 
2 
2 
12 
1 
1 
13 
1 
1 
2 
14 
2 
1 
3 
15 
1 
1 
1 
3 
16 
2 
2 
3 
3 
2 
1 
13 
17 
2 
2 
3 
4 
1 
12 
18 
1 
7 
7 
5 
20 
19 j 
1 
1 
3 
6 
4 
1 
16 
20 i 
2 
2 
5 
8 
3 
1 
21 
21 
2 
2 
3 
8 
10 
25 
26 
20 
1 
V. Left Oral Arm, 2 Days 
?S5 
8 
9 
10 
11 
12 
13 
14 
15 
6 
1 
1 
7 
0 
8 
1 
1 
9 
1 
1 
10 
1 
1 
11 
1 
1 
1 
12 
1 
1 
2 
13 
0 
14 
2 
2 
1 
5 
15 
1 
2 
3 
16 
1 
1 
1 
2 
5 
1 
1 
12 
17 
1 
5 
6 
12 
18 
2 
4 
9 
4 
1 
20 
19 
3 
4 
6 
1 
15 
20 
3 
7 
4 
5 
2 
21 
21 
1 
3 
4 
22 
1 
1 
2 
6 
8 
21 
34 
16 
11 
2 
THE JOURNAL OF EXPERIMENTAL ZOOLOGY, VOL. 9, NO. 4. 
