Plate 160 a. 



1. Priucipal canoe passage, Tapriva (Ocean Island), Baanapa ; elevated coralliferous 



limestone buttresses. 



2. Lagoon, flanked by pitted and honeycombed pinnacles of elevated coralliferous lime- 



stone, at northeast end of (Pleasant Island) Nauru. 



3. Buttresses of elevated coralliferous limestone, Tapriva (Ocean Island), Baanapa. 



1-3 from Photographs by Mr. John Arundel. 



