Abstract
Organ culture experiments were set up to investigate cell differentiation in the hermaphrodite gland of Arion ater L. They were carried out in the absence and presence of oestradiol, oestriol, testosterone and follicle stimulating hormones. In the absence of hormones explants of young animals showed mitotic divisions in spermatogonia; newly-differentiated spermatogonia were also observed in explants of the hermaphrodite gland of young and old animals. In the presence of oestriol hormone new germinal cells differentiated from the neck region of the hermaphrodite glands of mature animals. Other hormones did not affect the explants.
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