REPORT ON THE PETROLOGY OF OCEANIC ISLANDS. 



29 



IV.— ROCKS OF FERNANDO NORONHA. 



The group of small islands called, from the principal islet, by the name of Fernando 

 Noronha, is situated in the Atlantic, about 3° 50' S. lat. and 350 miles off the coast of 



Peak of Fernando Noronha, sketched from the deck of H.M.S. Challenger. 



South America. The soundings made by the Challenger in the neighbourhood of 

 these islands show that they rise somewhat abruptly from the bottom of the sea. 



