VARIATION IN ECHINOID PLUTEI 
707 
V. Right Oral Arm, 4 Days 
V. Left Oral Arm, 4 Days 
9 10 
11 
12 
13 
14 
15 
16 
12 
1 
1 
13 
1 
3 
4 
14 
4 
1 
5 
15 
1 1 
4 
7 
1 
2 
16 
16 
1 
5 
3 
9 
4 
22 
17 
10 
3 
10 
4 
27 
18 
1 
1 
6 
3 
2 
13 
19 
1 
3 
4 
1 
9 
20 
1 
1 
1 
3 
2 6 11 26 22 24 
9 
10 
11 
12 
13 
14 
15 
— 

10 
1 
1 
11 
12 
1 
1 
2 
13 
1 
1 
1 
3 
14 
1 
6 
15 
1 
2 
4 
5 
3 
2 
17 
16 
2 
2 
7 
7 
2 
20 
17 
1 
8 
8 
8 
1 
26 
18 
1 
1 
2 
1 
12 
19 
2 
I 
3 
2 
10 
20 
2 
1 
3 
2 
10 
9 
25 
29 
20 
V. Right Oral Arm., 5 Days 
V. Left Oral Arm, 5 Days 
10 
11 
12 
13 
14 
15 
16 
10 
11 
12 
13 
14 
15 
16 
10 
1 
10 1 
1 
11 
0 
11 
0 
12 
0 
e 
Q 
12 
0 
13 
1 
1 
»o 
13 
1 
1 
14 
1 
1 
14 
1 
1 
15 
1 
6 
7 
15 1 
4 
2 
7 
16 
2 
2 
3 
2 
2 
11 
16 2 
2 
2 
1 
3 
10 
17 
3 
5 
2 
4 
15 
17 
3 
5 
4 
4 
16 
18 
3 
9 
3 
2 
17 
18 
3 
5 
4 
1 
13 
19 
4 
2 
7 
5 
18 
19 
1 
4 
6 
6 
2 
19 
20 
6 
2 
4 
10 
3 
25 
20 
6 
6 
9 
9 
30 
21 
1 
1 
2 
21 
0 
22 
1 
2 
22 
1 
1 
23 
1 
1 
4 
3 
27 
21 
19 
21 
5 
! 4 
2 
21 
23 
26 
20 
4 
