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discovers that the outermost vegetation consists of larger and 

 smaller isle-shaped groups of Rhizophora. This mangrove is outer- 

 most growing in rather deep water about 2 — 4 feet. The bottom 

 is formed by fine mire on which is uppermost a layer of blue-green 

 algae but otherwise it is without any vegetation ; not until further 

 out where the bottom is firmer and more sandv, do we find the 



Fig. 15. View from the centre ^of Krausse's lagoon. The vegetation 

 bordering the water consists of Salicornia, Seauvinm etc. In the water 

 young mangrove plants are seen emerging. (F. B. phot.) 



alga vegetation of Caulerpa, Halimeda, Petiicillus, Vdotea and 

 others, besides sea-grass species common on such localities (comp. 

 fig. 1). Here and there some young seedlings of BhizopJtora are 

 seen emerging from the water, the outermost pioneers of the ad- 

 vancing mangrove vegetation. Towards land these mangrove is- 

 lands become larger and gradually grow together, and the water 



