. Into a world of primitive backboned ani- mals came many kinds of fishes in the period between 275 and 340 million years ago. Among these, the crossopterygian or lobe- finned group represented above by Os- teolepis were to become the direct ancestors of the first backboned animals to live on land ^i Only during the last 500 million years have plants nd animals produced hard parts capable of being fossil- zed. Here is a simplified chart of that quarter of the arth's history 41 Drawings by John C. Germann

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Keywords: ., bookcentury1900, bookpublishernewyork, booksubjectreptilesfossil