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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Navicula cuspidata Kuetz Navicula cuspidata var ambigua Ehr Cl Navicula spicula Hickie Cl Navicula integra Wm Sm Navicula mutica Kuetz Navicula americana Ehr Navicula pupula var bacillarioides Grun Navicula bacillum Ehr Navicula semen Ehr Navicula atomus Ngeli Navicula