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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Pleurosigma strigosum Wm Sm Pleurosigma rigidum Wm Sm Pleurosigma angulatum Quekett Cl Pleurosigma obscurum Wm Sm Pleurosigma formosum Wm Sm Pleurosigma naviculaceum Brb Pleurosigma stuarii Brb Pleurosigma virginiacum Smith org Charles Sumner Boyer PDoldauto Diatomaceae