Abstract
ABSTRACT Experiments were undertaken to investigate the cleavage pattern of eggs of Lymnaea developing into exogastrulae after a treatment for 2 h with 5 × 10−2 M-LiCl at 6 °C at the beginning of second cleavage. It appeared that the 16-cell stage is reached normally, but that in the vegetative cells the following division is considerably retarded. It is assumed that this delay is associated with the suppression of division asynchrony in the first quartet of micromeres, which normally adumbrates bilateral symmetry in the animal hemisphere, and with suppression of gastrulation.
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