The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ircuit of the nervous system is restored, often before the longwound has healed over. Transverse sections across the ganglia, however,are not followed by regeneration of the ganglia if more than about one-thirdof the brain is taken away. The nervous system forms a complete ring, andin every case, where this ring is broken, regeneration of the nerve cords takesplace sufficiently to restore the circuit, though the cerebral ganglia may ormay not be regenerated. Text-fig. V shows an animal (text-fig. Ill, 3) where the cut
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The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ircuit of the nervous system is restored, often before the longwound has healed over. Transverse sections across the ganglia, however, are not followed by regeneration of the ganglia if more than about one-thirdof the brain is taken away. The nervous system forms a complete ring, andin every case, where this ring is broken, regeneration of the nerve cords takesplace sufficiently to restore the circuit, though the cerebral ganglia may ormay not be regenerated. Text-fig. V shows an animal (text-fig. Ill, 3) where the cut passed acrossthe front of the ganglia, w^hich were subsequently completely restored. Text-Fig. VIII (text-fig. Ill, 6) shows an animal in which the cut removed bothganglia. In such conditions the nerve cords grow forward and fuse, but noganglia are regenerated, and the animals remain headless. Text-figs. VI andVII show two worms (text-fig. Ill, 4 and 5 respectively) where the cut hasdamaged both ganglia and where there is correspondingly defective restorationof the head.. —n.c. Mi^^0A0$^^^^Sf^^jMS^^^^^^} Fig. V.—Horizontal Longitudinal Section through Complete Eegenerated Head, 41 days(text-fig. Ill, 3). ^a., ganglion ; nx.^ nerve cord ; op.n.^ optic nerve. 362 Miss D. J. Lloyd. Influence of the Position of the op.n^. ^-v