100 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
thus far examined. These, however, are not the only stone reefs of the 
northeast coast of Brazil. There still remain several that have not been 
examined and about which very little is known. Under the circum- 
stances it seems best to give that little here, and to mention the places 
at which stone reefs are reported, whether anything else than their 
existence is known about them. 
Some important reefs'may have been omitted from this list, but it is 
doubtful whether facts to change any of the conclusions reached would 
have been obtained by an examination of the reefs not seen. 
In mentioning “reported” reefs, proper allowance has been made, in 
so far as possible, for the general disposition to lump all the reefs of this 
coast together. То navigators all reefs are pretty much alike, so much 
so that the Pernambuco stone reef, the best-known one of Brazil, is often 
put down in sailing directions for the south Atlantic as a coral reef. The 
confusion is further increased by the customary addition that this same 
reef borders the whole Brazilian coast. With such reports as these we 
try to have nothing to do, 
On my trip from Pernambuco to Natal in June, 1899, for the purpose 
of studying the reefs, it was not possible to examine all the places that 
it was desirable to examine because of the inaccessibility of the shores 
for the barcaga in which the trip was made. This difficulty was evaded 
in some instances by following the beaches on foot, but this was not 
always convenient, and necessarily delayed the work. 
Фшајй. — There is a line of reefs beginning three or four kilometres 
south of Pavuna (S. lat. 6° 32), in the State of Parahyba, and strotch- 
ing across the low lands in front of Rio Guajú. Rio Guajú enters the 
sea through a, flat valley between rather steep-faced hills. This reef was 
not examined, but its configuration and the nature of the country back 
of it lead me to believe it to be a sandstone reef. 
Sargi. — Across the mouth of another small stream north of the 
Guajú, probably the Sargí, is a reef which, seen from the ocean, has 
every appearance of being of sandstone. 
João dos Santos. — At João dos Santos a stream enters the ocean and 
reefs lie across the mouth of it and extend two or three kilometres to the 
south. The geography and general appearance lead me to believe it to 
be of sandstone. 
Tibau. — At Tibán (8. lat. 6° 11^) a small stream enters the ocean 
from behind a short reef that appears to be of recent sandstone. 
Camorupim. — About 2.5 kilometres north of Tibáu begins a stone 
reef which continues northward for several kilometres very close to and 
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