50%14
14
42
Amputation of the prostomium
14
JZL
m
50%
f
o0
0 1 2 3 4 5 6
\r
14
7
42
8 9 10 11 12 13 14 15 16 17
Θ
Control
L m j
I7I |7| LZJ
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
FIG. 26. Perinereis cultrifera. Number of segments regenerated in 30 days. A.
Prostomium removed 1 day after posterior segments were amputated. B. controls;
prostomium intact. (Durchon, 1956b.)
8 0 -
7 0 -
6 0 -
5 0 -
10I
A
0 P
50
40
30H
20
10 H
Number of segments regenerated
Ί m
0
P 1
50
40
30·
20-j
I0H
Number of segments regenerated
0 P 1 2 3 4 5 6
7 8 9
Number of segments regenerated
FIG. 27. Nereis diversicolor. Number of segments regenerated in 30 days. A. Supraoesophageal ganglion removed 1 day before posterior segments were amputated. B.
Supra-oesophageal ganglion removed 3 days after posterior segments were amputated.
C. Controls; supra-oesophageal ganglion intact. O, No regeneration; P, pygidium only
regenerated. (Clark and Bonney, 1960.)