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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Coccodiscida Diam Fig Amphicyclia chronometra sp Fig Amphicyclia pachydiscus sp Vertical section through the centre Fig Amphiactura amphibrachia sp Fig Amphiactura amphibrachia sp Vertical section through the centre Fig Diplactura diploconus sp Fig Trigonactura triacantha