. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 160 BULLETIN : MUSEUM OF COMPAEATIVE ZOOLOGY. formed only Avhere the living polyps and other reef builders are always covered by water. This does not necessitate their always being below low tide level, for corals grow constantly in tide-pools, and Serpulae often build up rims enclosing basins whose surfaces are left several feet above low tide. In such basins corals may flourish above sea-level. But while these cases ai'e not at all uncommon, the ai'ea covered by them, when con- sidered in relation to the wh
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. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 160 BULLETIN : MUSEUM OF COMPAEATIVE ZOOLOGY. formed only Avhere the living polyps and other reef builders are always covered by water. This does not necessitate their always being below low tide level, for corals grow constantly in tide-pools, and Serpulae often build up rims enclosing basins whose surfaces are left several feet above low tide. In such basins corals may flourish above sea-level. But while these cases ai'e not at all uncommon, the ai'ea covered by them, when con- sidered in relation to the whole area of the coral reefs of which they form part, is very small indeed.. '^'?^-~;Cl â â â ^â ^^f^%^ Fig. High Kock, Maceio coral reef. From a pliotograph by F. Ambler. Along the entire coast from Parahyba do Norte to Parcel das Paredes, the Abrolhos, and Coroa Vermelha, the coral reefs not only rise above low tide water over enormous areas, but the upper sui'faces of all these exposed reefs are dead, excepting in so far as they are made of such things as grow in tide-pools. In the north the coral reefs are universally bored by mollusks, sea-urchins, etc., and for the most part have an etched appearance. In the State of Alagoas, three kilometres south of Sao Miguel dos Milagres and north of the Rio Camaragibe, there are exposures, at low tide, of coral reefs upon the sandy shore. At the mouth of a small stream the reef has been covered by sand, and later it has been again. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum