VARIATION IN ECHINOID PLUTEI 
//. Left Oral Arm, 5 Days 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
19 
20 
21 
22 
23 
H 
9 
1 
1 1 
10 
0 
11 
0 
12 
1 
1 
13 
0 
1 
1 
15 
2 
2 
lo 16 
1 
1 
2 
f 18 
4 
1 
1 
1 
7 
1 
2 
3 
^19 
1 
1 
1 20 
1 
1 
1 
4 
^ 21 
1 
2 
: 
2 
6 
CI 22 
1 
2 
1 
4 
3 
17 
^ 23 
1 
2 
3 
i 
2 
11 
24 
3 
3 
2 
3 
13 
25 
1 
1 
1 
8 
4 
4 
19 
26 
1 
1 
27 
1 
1 
3 
3 
1 
9 
28 
1 
1 
29 
1 
1 
1 
2 
0 
9 
2 
4 
5 
2 
11 
12 
10 
18 
8 
11 
1 
4 
1 
1 
