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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Synedra oxyrhynchus var undulata Grun Synedra pulchella var flexella var Synedra affinis Kuetz Synedra affinis var tabulata Ag Synedra vaucheri var parvula Kuetz Rab Synedra affinis var parva Kuetz Synedra radians Kuetz Dimerogramma marinum Greg Dimerogramma surirella