SUBMARINE DEPOSITS. 293 
the Bermudas, and extending to the north as far as latitude 38°. 
Commencing at about lengitude 50* W., it follows southward 
and тайга toward South America nearly the line between 
two and three thousand fathoms. It has been found close to 
Porto Rico in deep water, and covers the floor of the ocean be- 
tween it and the Bermudas. The western boundary of the 
red-clay basin is not yet clearly defined. A narrow strip of this 
basin reaches southward towards the ridge which separates it 
from the northern extremity of the red- Мау basin of the west- 
ern South Atlantic. The smaller red-clay basin of the eastern 
Atlantic les between the Cape Verde Islands and the Dolphin 
Rise. The eastern red-clay basin of the South Atlantic, sepa- 
rated by the Challenger Ridge from the western red-clay basin, 
is situated to the westward of equatorial Africa. The western 
red-clay basin of the South Atlantic probably stretches into the 
Southern Ocean. 
