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Keywords from Image Description:
PSM Rhizopods. Rhizopods Orbulina universa Globigerina rubra Chrysalidina gradata Cuneolina pavonia Grammostomum phyllodes Rotalia globosa Flabellina rugosa Frondicularia annularis Nummulites nummularia archive org Popular Science Monthly Volume Author PDold Popular Science Monthly illustrations Foraminifera Orbulina Globigerina