BRANNER: THE STONE REEFS OF BRAZIL. 281 
PLATE 39. 
The vertical outer face of the Mamanguápe reef, looking southward at low tide. 
See pages 47—55. 
PLATE 40. 
Blocks of compact sandstone thrown by the surf across the Mamanguape reef. 
The inner reef crosses the middle of the background. See page 50. 
PLATE 41. 
A characteristic bit of surface etching on the Mamanguápe reef. See page 52. 
PLATE 42. 
The eroded surface of the Mamanguäpe reef partly covered with barnacles. See 
page 58. 
PLATE 43. 
Sea-urchin holes in the seaward face of the Mamanguápe reef. See page 53. 
PLATE 44. 
Looking southward near the southern end of the Mamanguápe reef. The Mirimirí 
cliffs are visible in the distance. See pages 47-55. 
PLATE 45. 
Mamanguäpe Point, and the southern end of the inner reef seen from the outer reef 
guap , 
looking westward. See page 55. 1 
PLATE 46. 
The sand plains at Cabedello, Parahyba do Norte. Photograph by Mr. Sumner. 
See pages 232-235. 
PLATE 47. 
The Pernambuco stone reef. Photograph taken in 1876 by the Commissão Geo- 
logica. See pages 60-67. 
PLATE 48. 
The Pernambuco reef taken from the old Dutch fort. See pages 60-67. 
PLATE 49. 
Surface of Pernambuco reef. Photograph taken in 1876. See pages 60-67. 
