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bulletin: museum of comparative zoology. 



This last section is a typical profile of much of the Cabo Santo Agos- 

 tinho reef. The outer face is not broken off vertically, but slopes rather 

 abruptly and with a somewhat irregular face beneath the sea. 



At Camboa Point the reef is solid and vertical on its landward face. 

 At and south of the Camboa residence (1.4 kilometres south of Camboa 

 Point) the section is as follows : 



Fig. 43. Section of the Santo Agostinho reef at Camboa. 



The features of this portion of the reef are well shown in Plates 53 

 and 54, from photographs taken July 25, 1899. 



As the southern end of the reef is approached, it disappears beneath 

 the sands of the beach, and the section is thus : 



Fig. 44. Across Cape Santo Agostinho reef at its southern extremity. 



The great tide-pools that lie on top of and in the axis of the reef have 

 already been mentioned. These pools abound in corals. and calcareous 



seaweeds, and contain some cor- 

 allines ; and it may be fairly 

 said that small coral reefs have 

 started in these pools. The 

 corals are mostly of small spe- 

 cies, Porites, Favia, and Aga- 

 riria. In some of the shallower 

 pools some of these calcareous 



growths have been broken off 

 Fig. 45. Tide-pools on the landward edge ^ ^^^ g^,^.f ^^^^^^ ^^^^^^ j-^^ 

 of the reef. •' 



pebbles, and tossed over on the 



sandy beach behind, or left to be rolled still more in the reef pools. 



There are still other pools on the surface and in the axis of the reef 



but on its landward face ; as shown in the accompanying profile, they are 



especially noticeable. 



