xxxn SUMMARY 501 



pointed out that there are in this locality two varieties of 

 Rhizophora mangle, a large and a small variety, the first 

 approaching in some of its characters the Asiatic species, R. 

 mucronata, and being akin also to the seedless intermediate form 

 of Fiji. 



(9) Amongst other matters dealt with in this chapter are the 

 floating seed-drift of the Guayas or Guayaquil River and the shore 

 plants and stranded seed-drift of the Panama isthmus. From the 

 locality last named we learn that rivers bring down from the 

 interior to the Atlantic and Pacific coasts much the same seed- 

 drift, and that from this centre littoral plants with buoyant seeds 

 can be distributed over the whole tropical zone. 



