VARIATION IN ECHINOID PLUTEI 
703 
IV. Right Oral Arm, 2 Days 
IV. Left Oral Arm, 2 Days 
6 
7 
si 
1 
9 
10 
11 
12 
12 
1 
1 
1 
3 
13 
1 
j 
3 
1 
8 
14 
2 
2 
3 
1 
9 
15 
2 
7 
2 
2 
18 
16 
2 
1' 
2 
8 
5 
2 
20 
17 
2 
1 
9 
11 
8 
1 
32 
18 
1 
1 
1 
2 
4 
19 
1 
.1 
5 
1 
6 
4 
7 
12 
24 
28 
18 
7 
6 
7 
8 
9 
10 
11 
12 
12 
1 
1 
2 
13 
1 
2 
4 
1 
8 
14 
2 
2 
1 
1 
2 
1 
9 
15 
6 
4 
6 
3 
2 
21 
16 
1 
2 
2 
3 
10 
5 
1 
24 
17 
2 
7 
10 
6 
2 
27 
18 
1 
1 
2 
4 
19 
3 
1 
1 
5 
4 
7 
12 
22 
31 
16 
8 
IV. Right Oral Arm, S Days 
IV. Left Oral Arm, 3 Days 
7 8 
1 
2 1 
' 3 
, 1 
1 
1 
10 11 12 13 14 
1 
0 
0 
3 
5 
2 
15 
21 
1 15 
1 23 
7 
I 7 
1 
4 6 26 39 13 9 1 2 
8 
9 
10 
11 
12 
13 
14 
8 
0 
9 
0 
10 
1 
1 
2 
11 
3 
1 
4 
12 
1 
1 
4 
6 
13 
1 
3 
4 
14 
2 
1 
8 
3 
1 
1 
16 
15 
2 
8 
9 
2 
1 
1 
23 
16 
2 
3 
8 
2 
1 
16 
17 
1 
4 
8 
4 
4 
21 
18 
3 
1 
4 
19 
1 
1 
2 
20 
1 
1 
2 
4 
6 
28 
38 
14 
7 
2 
1 
