1. The anlage of the lateral appendix is formed from the dorso-Iateral part of the olfactory placode in Rana nigro-maculata Hallowell.

2. The lateral appendix, a blind sac, is formed when the dorsal lumen is differentiated in its anterior part.

3. It increases in dimension as the olfactory placode further develops, but growth stops as soon as the anterior lower sac appears; it begins to degenerate when the medial nasal gland makes its appearance; and completely disappears towards the end of metamorphosis.

4. Histological changes are described.

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