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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Actinocyclus barkleyi var aggregata Rattr Actinocyclus moniliformis Ralfs Biddulphia antediluviana Ehr Biddulphia reticulum Ehr Biddulphia favus Ehr Biddulphia alternans Bail Trinacria pileolus Ehr Grun Ditylum intricatum West Grun Terpsino americana Bail Ralfs Terpsino