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Keywords from Image Description:
Radiolaria Challenger Plate . follows Plate Phacodiscida Diam Fig Heliodiscus pertusus sp vel Heliosestrum pertusum Irregular form with ten instead of eight larger latticed spines Fig Heliodiscus glyphodon sp vel Heliosestrum glyphodon Fig Heliodrymus ramosus sp Fig Heliodrymus ramosus sp Medullary shell and segment