Geology and Mineralogy. 231 
southeast in a direction also about parallel to the shore line. At 
the western end of the Caribbean Sea, the 100-fathom line forms a 
gigantic bank off the Mosquito coast, extending over one-third 
n 
Jamaica has a depth of 3,000 fathoms, and that between Hayti 
and Cuba is not less than 873 fathoms, the latter being probably 
an arm of the Atlantic. The 500-fathom line connects, as a gigan- 
leaving Barbadoes to the east, and a narrow passage 
between Martinique and the islands of Dominica and St cia. 
must, of course. d north, have swept round the 
on peaangee yg 3 Virgin Islands, Porto Rico and Hayti, and 
