a—l 3.

No. 20. Sand-drift from Shore killing Grass in Dune-hollow. In Centre and to Right Mariscus ustulatus.

[Photo L. Cockayne.

No. 22. The Sand-collecting Shrub Coprosma acerosa building a Small Dune. On Left almost buried.

[Photo L. Cockayne,.

No. 19. Advance of Wandering Dune stopped by River Turakina. Wellfixed Portion of Dune above.

[Photo Tj. Cockayne.

No. 21. Scirpus frondosus building Mounds on Shore. Reef-point in Distance. North-west Auckland.

[Photo Tj. Cockayne.