Geological Contemporaneity And Persistent Types of Life
Geological Contemporaneity And Persistent Types of Life
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There is no certainly known extinct order of Protozoa; there is but oneamong the Coelenterata--that of the rugose corals; there is noneamong the Mollusca; there are three, the Cystidea, Blastoidea, andEdrioasterida, among the Echinoderms; and two, the Trilobita andEurypterida, among the Crustacea; making altogether five for thegreat sub-kingdom of Annulosa. Among Vertebrates there is no ordinallydistinct fossil fish: there is only one extinct order of Amphibia--theLabyrinthodonts;... but there are at least four distinct orders ofReptilia, viz. The Ichthyosauria, Plesiosauria, Pterosauria, Dinosauria, and perhaps another or two. There is no known extinct order ofBirds, and no certainly known extinct order of Mammals, the ordinaldistinctness of the "Toxodontia" being doubtful.
The objection that broad statements of this kind, after all, restlargely on negative evidence is obvious, but it has less force than mayat first be supposed; for, as might be expected from the circumstancesof the case, we possess more abundant positive evidence regarding Fishesand marine Mollusks than respecting any other forms of animal life;and yet these offer us, through the whole range of geological time, nospecies ordinally distinct from those now living; while the far lessnumerous class of Echinoderms presents three; and the Crustacea two, such orders, though none of these come down later than the Paleozoicage.
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To quickly assess the difficulty of the text, read a short excerpt:
Of the whole.
There is no certainly known extinct order of Protozoa; there is but oneamong the Coelenterata--that of the rugose corals; there is noneamong the Mollusca; there are three, the Cystidea, Blastoidea, andEdrioasterida, among the Echinoderms; and two, the Trilobita andEurypterida, among the Crustacea; making altogether five for thegreat sub-kingdom of Annulosa. Among Vertebrates there is no ordinallydistinct fossil fish: there is only one extinct order of Amphibia--theLabyrinthodonts;... but there are at least four distinct orders ofReptilia, viz. The Ichthyosauria, Plesiosauria, Pterosauria, Dinosauria, and perhaps another or two. There is no known extinct order ofBirds, and no certainly known extinct order of Mammals, the ordinaldistinctness of the "Toxodontia" being doubtful.
The objection that broad statements of this kind, after all, restlargely on negative evidence is obvious, but it has less force than mayat first be supposed; for, as might be expected from the circumstancesof the case, we possess more abundant positive evidence regarding Fishesand marine Mollusks than respecting any other forms of animal life;and yet these offer us, through the whole range of geological time, nospecies ordinally distinct from those now living; while the far lessnumerous class of Echinoderms presents three; and the Crustacea two, such orders, though none of these come down later than the Paleozoicage.
What to read after Geological Contemporaneity And Persistent Types of Life?
You can find similar books in the "Read Also" column, or choose other free books by Huxley Thomas Henry to read onlineMoreLess
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