196 



MEXICO, CENTRAL AMERICA, WEST INDIES. 



geological survey of the interior, which will probably show that the banks of the 

 parallel rivers and lagoons are really composed of coralline rocks constituting 

 west and east a series of terraces with very broad steps. An analogous pbeno- 



Fig 83. — Pae.\llelisîi of the Old axd Recent Watercoueses. 

 Scale 1 : 3,000,000. 



to50 

 Fathoms. 



Depths. 



,"50 10 Ô00 

 Fathoms 



500 F.itlioms 

 and upwards. 



, 60 Miles. 



raenon is presented by the concentric shores of Florida, which were successively 

 formed by the coral-builders during the course of ages. 



The islands in the gulf beyond the fringing reefs also follow the general 

 direction and belong to the same formation. Thus Turnefîe, that is, Tierra Nueva, 

 a verdant group facing Belize, rests on a foundation of reefs whose channels, partly 



