Plate 16. 



RANGIROA. 



1. Lagoon bfincli, south side of atoll. W. Mci\I. W., Phot. 



2. Gap in land rim, south side of atoll, seen from the lagoon side lookinp; towards old 



ledge sea wall, outliens of sea wall protruding in the gap. M. A., Phot. 



