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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Nitzschia spectabilis var americana Grun zone view Nitzschia panduriformis Greg Hantzschia amphioxys Ehr Grun Hantzschia amphioxys var major Grun Nitzschia dubia Wm Sm Nitzschia amphioxys Wm Sm Nitzschia compressa Bail Nitzschia compressa var minor Smith Surirella intermedia