VARIATION IN ECHINOID PLUTEI 
//. Left Oral Arm, 4 Days 
7 8 
1 
9 10 
1 1 
1 1 
19 
14 
1 ^ 
ifi 
17 
IS 
1Q 
90 
10 
1 
1 
11 
0 
12 
1 
1 
1 
1 
4 
13 
0 
14 
1 
1 
15 
1 
1 
1 
1 
2 
1 
7 
16 
1 
2 
1 
4 
17 
1 
1 
1 
1 
2 
6 
18 
1 
1 
1 
10 
19 
\ 
? 
2 
2 
1 
1 
8 
20 
5 
4 
2 
1 
16 
21 
1 
3 
2 
2 
8 
22 
1 
1 
5 
1 
13 
23 
3 
3 
10 
24 
1 
6 
7 
25 
1 
4 
26 
0 
27 
1 
1 
28 
0 
1 
0 
0 
3 
5 
3 
4 
15 
11 
16 
13 
16 
