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Keywords from Image Description:
Diatomaceae of Philadelphia Plate . follows PLATE Fig Coscinodiscus radiatus Ehr Coscinodiscus velatus Ehr Coscinodiscus biangulatus Coscinodiscus subaulacodiscoidalis Rattr Coscinodiscus lewisianus Grev Coscinodiscus argus Ehr Coscinodiscus lineatus Ehr Coscinodiscus marginatus Ehr Coscinodiscus oculusiridis Ehr Actinocyclus