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Not only have by far the most of the now extinct genera and species their family and stem-companions, and many even their genera and species companions, in the living world, but also those genera whose nearer relations are now extinct as, for instance, the club-moss-trees, the trilobites, the ammonites, the belemnites, the sauria, the nummulites, show still a very perceptible relationship with living genera, and can be quite accurately included in the botanical and zoölogical systems; nay, they even fill up gaps in it.
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