92 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
tide. This reef runs into the beach four hundred metres north of the 
river. It has a decided dip to seaward. 
Following along the beach a hundred metres or so from the southern 
end of this reef, one comes up behind a second stone reef that stands out 
in the water some seventy-five or one hundred metres from the beach. 
8-1-13. 
MILES. 0 
KILOS. © 
Fie. 59. 
1 
^ ATLANTIC OCEAN. 
RIO PRATAGY 
STONE REEFS 
RIACHO DOCE. 
Just around the turn of the shore is a third reef, — this one upon the 
beach. It dips seaward beneath the outer reef, which is here only about 
forty metres away from it. The size and position of this shore reef are 
shown on the accompanying map. 
