282 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



PLATE 50. 

 Pernambuco reef rock bored by sea-urchins. See pages 60-67. 



PLATE 51. 



The sandstone reef on the beach north of Gaibii, seen from above the old Dutch 

 fort at Gaibii. See pages 69-71. 



PLATE 52 a. 



The sandstone reef running south from Cabo Santo Agostinho. (No. 52 b forms 

 a panorama with this.) See pages 71-78. 



PLATE 52 b. 



Part of the panorama of the sandstone reef south of Cabo Santo Agostinho. This 

 view joins No. 52 a on the right. See pages 71-78. 



PLATE 53. 



A part of the Cabo Santo Agostinho reef near its southern end at Camboa. The 

 sand flat between the reef and the shore is uncovered at low tide. See pages 



71_78 



71-78. 



PLATE 54. 



The stone reef south of Cabo Santo Agostinho seen from near its southern end and 

 from tiie rear at low tide. There is a long pool of water on top of the reef at 

 this place. See pages 71-78. 



PLATE 55. 



The sandstone reef near the lighthouse at Bahia. Photograph taken in 1876. In 

 1899 these vast rocks had all been quarried out. See pages 93-95. 



PLATE 56. 

 The north end of the sandstone reef at Santa Cruz, State of Bahia. See page 95. 



PLATE 57. 



The stone reef at Porto Seguro, State of Bahia. Photograph taken from a steamer 

 inside of the reef at high tide. See pages 97-99. 



PLATE 58. 



Copy of the map of Pernambuco and the reef published by Caspar Barlaeus in 

 1647. See page 116. 



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