. Carnegie Institution of Washington publication. . 476 'X*£ "'^ *' '3$ v' t< 'Sr^ •"'' -^SLv - 'S '-*t-' ^- V'^^*^ ^ .,' FV^.fT^ - ,&,,^ ^,- H ^ •-i, 4* ' e. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington

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