The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ^^r-. ;e5.^. Fig. IX.—Section through IBEeteromorphic Head, 20 days (text-fig. IV, 8). e., eye ; (/., gut; ga., ganglion : ^ optic nerve ; , parenchyma cells. IV. was mentioned earlier in the paper, Child (1) has already shownthat the presence of at least half the cerebral ganglia is necessary forcomplete regeneration in Leptoplancc. The removal of more than half VOL. LXXXVII.—B. 2 E 364 Miss D. J. Lloyd. Influence of the Position of the the ganglia causes the production of defective heads. When
The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ^^r-. ;e5.^. Fig. IX.—Section through IBEeteromorphic Head, 20 days (text-fig. IV, 8). e., eye ; (/., gut; ga., ganglion : ^ optic nerve ; , parenchyma cells. IV. was mentioned earlier in the paper, Child (1) has already shownthat the presence of at least half the cerebral ganglia is necessary forcomplete regeneration in Leptoplancc. The removal of more than half VOL. LXXXVII.—B. 2 E 364 Miss D. J. Lloyd. Influence of the Position of the the ganglia causes the production of defective heads. When ganglia andnerve roots are completely removed head-formation is entirely behaviour of Planaria dorotocephala was found by Child (2) to bein direct contrast to this. Flanaria dorotocephala under normal condi-tions regenerates the anterior end completely from any point of is only when regeneration is suppressed by the addition of anaestheticsor potassium cyanide that defective heads are produced essentially similarto those obtained in Leptoplana and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectproceed, bookyear1914
