PLATE 234. 
Geological Chart of the islands in the tropical Pacific : 
Yellow, coral reefs, underlying base not known. 
Blue, voleanic islands. 
Carmine, elevated limestones. 
Blue and carmine, voleanic islands surrounded by reefs, partly elevated, 
Green, coral reefs, probably underlaid by rocks of nearest land. 
Blue and yellow, voleanic islands surrounded by encircling reefs. 
