LAGOON 
ISLANO 
Plate 3. The conspicuous features of an atoll and its peripheral reef (after Tracey, Cloud, and Emery, 1955). Hypothetical section, not to scale. 
Principal features are shown in capital letters; other features, subdivisions, and explanatory notes are indicated in lower-case letters. Terms enclosed 
in brackets are the ones that have been used in this report. 
a— 
Plate 4. Index map of the Indo-Pacific Region. 
