Abstract
1. 1. The central nervous system in the leech, Erpobdella lineata, consists of 21 pairs of cell compartments. 2. 2.AF (aldehyde fuchsin) positive α-cells were observed in the buccal ganglion, cell compartment 8 or 9 and the subesophageal ganglion, cell compartment 11. 3. 3. The cytoplasm of α-cells in cell compartment 11 stained markedly with AF in winter but stained slightly from spring to early autumn. 4. 4. Germ cells in the testes developed actively from spring to early autumn but they scarcely advanced in winter. 5. 5. It is suggested that the neurosecretory materials accumulated in the cytoplasm of α-cells during winter are released from the cell and act on the testes to promote spermatogenesis from spring to early autumn.
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