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Polypterus congicus, a Crossopterygian fish from the Gongo River. Young, with external gills.
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Polypterus bichir.
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Po.lypterus delhesi Boulenger. Congo River.
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Polypterus congicus, a Crossopterygian fish from the Congo River. Young, with external gills.
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Lower jaw of Polypterus bichir, from below.
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Erpetoichthys calabaricus Smith. Senegambia.