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Restoration of under side of a trilobite

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Restoration of under side of a trilobite.jpg Skeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephantSkeleton of TriceratopsMiniaturesHead of the ancestral elephant

Restoration of under side of a trilobite (Triarthrus becki), the trunk limbs bearing small triangular respiratory lobes or gills.—After Beecher.