PLATE 6 
EXPLANATION OF FIGURES 
15 Same as figure 14. Worm killed after three days and twelve hours’ regen- 
eration. 
16 Worm killed fourteen days after removal of three segments of the cord. 
Regeneration not complete. X 107. 
17 Worm having three segments removed, grown in dirt for three months 
after normal movements had been recovered. All tissues appear normal except 
that two ganglia are shorter than the rest. X 107. 
190 
