THE BENTHAL 221 



Ceylon, where yellowish green Alcyonaria accompany sea-green hetero- 

 pores, malachite green Anthophyllae stand beside olive green mille- 

 pores, and emerald green madrepores and astraeas beside brownish 

 green montipores and maeandrinas. 86 



The animal life of the lagoons of barrier reefs and atolls is con- 

 siderably different from that of the outer face of the reef. The corals 

 themselves, in quiet water, have quite different habits of growth, and 

 are often slender, branched, and fragile. They are less commonly 

 continuous, but form spots and accumulations in limited areas. In the 

 lagoons of the Marshall Islands, millepores are the most abundant 

 corals, with Pontes next. Solitary corals are frequent in the lagoons. 

 The bottom of the lagoon is covered with coral sand and calcareous 

 mud derived from the erosion on the reef, where currents do not stir 

 it up, and this is probably one of the reasons for the failure of corals 

 to flourish in the lagoons. The number of animals in the lagoon varies 

 according to local conditions. Agassiz found the lagoons of Pinaki and 

 Rangiroa rich in fishes. Fishes of the lagoon are mostly dull colored, 

 in contrast with those of the reef. In Pinaki the deeper parts of the 

 lagoon contained numerous Tridacna, which were, in some places, 

 crowded together like the oysters of an oyster bed, and a species of 

 Area also covered considerable areas of the bottom of the lagoon. 



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