Plate 20. 



1. Eutrance to IMataliiva on northeast extremity of the atoll. 



2. West shore of Tikahau, looking southeast. 



3. Land rim and gap on the southwest sliore of Tikahau. 



4. "Wide reef flat platform, southwest shore of Tikahau, looking southeast. 



1-4, W. McM. \V., Phot. 



