branner: the stone reefs of brazil. 



57 



dropped a little as if undermined and let down in place right iu the 

 body of the reef. 



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',,w.mJKllmJJJ>M^i!U^^Jl^n:!W. 



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StiSlr 



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Fig. 28. I'edra de Gulo reef. From a photograph taken at low tide 



Fig 



Both on the outside or sea^yard face and on the inside square-faced 

 blocks have broken off and been let down at various angles. 



Barnacles cover much of the surface. In the surface tide-pools Pon'te$ 



