WEST INDIES. 
273 
the other two reefs is only from one to three fathoms. From 
this circumstance, and from their similarity in form, struc- 
ture, and relative position, both to the hank called Northern 
Triangles, on which there is an islet between 70 and 80 
feet in height, and to Cozumel Island, the level surface of 
which is likewise between 70 and 80 feet high, it is probable 
that the three foregoing banks are the worn-down bases of 
uplieaved shoals, fringed with corals ; left uncoloured. 
In front of the eastern Mosquito coast there are, between 
lat. 12° and 16°, some extensive banks (already mentioned), 
with high islands rising from their centres, and others wholly 
submerged, both kinds being bordered, near their windward 
margins, by crescent-shaped coral-reefs. But it can hardly 
be doubted that these banks owe their origin, like the great 
bank extending from the Mosquito promontory, almost en- 
tirely to the accumulation of sediment, and not to the growth 
of corals ; hence I have not coloured them. 
Cayman Island : this island appears in the charts to be 
fringed ; and Captain B. Allen informs me that reefs extend 
about a mile from the shore, and have only from 5 to 12 feet 
of water within them ; coloured red. — Jamaica : judging 
from the charts, about 15 miles of the S.E. extremity, and 
about twice that length at the S.W. extremity, and some 
portions on the S. side near Kingston and Port Royal, are 
regularly fringed, and are therefore coloured red. From the 
plans of some harbours on the N. side, parts of the coast ap- 
pear to be there fringed ; but I have not coloured them. — 
St. Domingo : I have not been able to obtain sufficient 
information, either from plans of the harbours, or from 
general charts, to enable me to colour any part of the coast, 
except GO miles from Port de Plata westward, which seems 
regularly fringed : many other parts, however, of the coast 
are probably fringed, especially towards the eastern end of 
the island. — Piierto Rico : considerable portions of the 
southern, western, and eastern coasts, and some parts of the 
