76 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 Camböa Point the reef is solid and vertical on its landward face. 
At and south of the Cambóa residence (1.4 kilometres south of Cambóa 
Point) the section is as follows : 
Fro. 43. Section of the Santo Agostinho reef at Camböa. 
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: 
Ета. 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- 
vicia. In some of the shallower 
pools some of these calcareous 
i growths have been broken off 
Fra. 45. Жал обем landward edge by the surf, rolled about like 
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. 
