Abstract
In Lymnaea stagnalis, as in sea urchins, lithium ions cause disturbances of development, notably exogastrulation and head malformations (Raven, 1942). As the effect of a Li-treatment presents itself only after several hours or days of development, the question was raised of the site and the nature of the primary action of the ion in the egg cells, even though it had never been proved that Li actually enters the cells.

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