SECTION ACROSS THE &ULF OF MEXICO 

 FROM LOO&ERHEAD KEY, DRY TORTU&AS, TO E. COAST OF MEXICO 



VERTICAL SCALE 100 TIMES THE HORIZONTAL. 



THE DREDGINCS OF JUNE 1877 ARE MARKED THUS 



THOSE OF MAY I87S THUS THOSE 



OF JULV ]«77 THUS__ _ .THE OTHERS A. P, E 

 DATED. 



