SUVADIVA. 137 



itself, Hanlus Island is covered with large trees. In Dandu Pass we found 

 the corals, judging from the extent of the patches, to be growing in great 

 abundance on both sides of the pass, on the reef flats flanking it to the 

 north and south. 



On the eastern points of many of the islands on the east face masses 

 of small coral boulders were thrown up on the outer edge of the reef flats. 

 Shingle beaches also stretched along the more exposed faces of the islands ; 

 the base of the steep shingle or sand beaches was frequently protected 

 by stretches of beach rock. Diaddu Island is marked by a long spit ex- 

 tending westward nearly two miles beyond the entrance of the pass to the 

 north of the island. - 



On the east face of the island to the north of Kandu Huludu (PI. 74, 

 fig. 1) are several fine stretches of shingle beaches. At the south end of 

 Kandu Huludu a large, elongated bay has been formed by the shutting off 

 of a part of the reef by coral boulder and reef rock ledges and shingle 

 beaches thrown up along the outer edge of the reef flat. Other reef rock 

 ledges also crop out on the reef flat between the sandy beaches of the bay 

 and the outer line of breakers on the edge of the reef flat. Long bays, 

 like the one described above, when closed by the junction of points of 

 adjacent islands, form a shallow lagoon parallel in a general way to the 

 trend of the outer reef flat ; while, when formed by patches parallel to 

 the inner edge of the reef flat, which have enclosed parts of the lagoon, 

 they often become lagoons of considerable depth. It should be remem- 

 bered that in the building up of a faro, the walls are continuous and 

 usually enclose a deep lagoon, while the lagoons on reef flats are gen- 

 erally shallower, and their rims formed by the coalescence of independent 

 coral patches or bars of sand or of recent reef rock ; this often crops out 

 on the reef flat between the inner edge of the reef flat and the outer line 

 of breakers. 



The western point of the wide reef flat to the south of Kandu Huludu 

 is edged by a well-marked belt of coral boulders and of reef rock ledges 

 with heaps of coarse coral shingle, forming incipient islands on the western 

 face of the reef flat. The east face of Huluwarolu, to the south of Kandu 

 Huludu Pass, is flanked by high shingle beaches. 



