VARIATION IN ECHINOID PLUTEI 
691 
/. Right Oral Arm, 4 Days 
I. Left Oral Arm, 4 Days 
10 
11 
12 
13 
14 
15 
16 
5 
1 
1 
1 
1 
4 
1 
I 
1 
3 
7 
2 
1 
3 
8 
1 
1 
1 
4 
\ 
5 
8 
10 
1 
1 
3 
I 
1 
1 
8 
11 
5 
2 
2 
9 
12 
1 
1 
2 
7 
5 
1 
17 
13 
2 
1 
2 
2 
10 
14 
1 
7 
I 
3 
1 
17 
15 
2 
3 
4 
2 
3 
14 
16 
0 
17 
1 
1 
1 
3 
1 
3 
9 
27 
25 
23 
.9 
3 
9 
10 
11 
12 
13 
14 
15 
16 
5 
1 
1 
1 
1 
4 
£• 
D 
1 
1 
1 
Q 
O 
7 
2 
1 
1 
4 
8 
1 
1 
1 
1 
4 
9 
1 
3 
3 
7 
10 
1 
1 
4 
4 
2 
1 
13 
11 
2 
5 
2 
1 
1 
11 
12 
1 
3 
3 
5 
1 
14 
13 
4 
1 
1 
4 
: 
11 
14 
1 
4 
4 
3 
2 
14 
15 
1 
4 
5 
3 
13 
16 
1 
1 
17 
1 
1 
0 
4 
29 
25 
19 
12 
2 
I. Right Oral Arm, 5 Days 
11 
12 
13 
14 
15 
16 
9 
1 
1 
10 
0 
11 
1 
1 
2 
12 
2 
3 
1 
13 
5 
2 
4 
12 
14 
1 
7 
4 
5 
24 
15 
5 
7 
11 
10 
1 
34 
16 
1 
2 
4 
4 
5 
16 
17 
1 
1 
1 
2 
5 
1 
23 
20 
25 
25 
6 
I. Left Oral Arm, 5 Days 
11 12 13 14 15 16 17 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
2 23 
17 
25 24 : 8 
I 1 
I 1 
lit 
I 12 
I 24 
I 25 
1 15 
; 6 
1 
