[Differentiation of the prostate in the snail Helix aspersa Müll].

The differentiation of the snail Helix aspersa prostate gland is studied in animals from one to six months old. After the presentation of organogenesis the primary stage of secretion (3 months) and a stage where the prostate gland shows abundant secretions (6 months) were described; but the oviduct is still indifferentiated. The ultrastructural analysis shows the formation of secretory and ciliated cells in epithelioid prostatic tubes.