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have marked significance. I may tai'tlier point out tliat in the 

 localities of the Danish West Indies where the sand vegetation and 

 the mangrove vegetation are growing together, the sand vegeta- 

 tion is growing outermost towards the sea, and then sheltered by 

 it the mangrove or Conocarpus formation. 



As mentioned before, the habitat proper of the mangrove is 



Fig. 3. Young lihizophora-hushes growing on rocky coast in the bay beliind 

 Christiansfort in Gruzbay at St. Jan. (F. B. phot.) 



the muddy shores, especially at the head of fiords and bays which 

 are protected by off-lying coral-reefs against the open sea (see 

 %. 2) but as pointed out the mangrove plants are also found 

 growing, not only on sandy soil but also on the bare rock. Strictly 

 speaking I suppose the development to be, that the mangrove 

 vegetation begins on rocky or sandy substratum and gradually as 

 it increases in growth and produces stagnant water between its 



