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Restoration of under side of a trilobite

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Restoration of under side of a trilobite.jpg Head of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of TriceratopsHead of the ancestral elephantThumbnailsSkeleton of Triceratops

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