The Chain of Life in Geological Time a Sketch of the Origin And Succession of
The Chain of Life in Geological Time a Sketch of the Origin And Succession of
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After Billings.
a, Aperture. B, Inner wall. C, Outer wall. , Nucleus, or primary chamber. Z>, Internal cavity.
with spicules ; but these I have ascertained to be merely acci- dental, and will be referred to in the next chapter. The true structure of Archseocyathus consists of radiating calcareous plates enclosing chambers connected by pores. Archaeocyathus came in with the Later Cambrian, and seems to have died out in the Siluro- Cambrian. The only more modern things which at all resemble it ar...e the Foraminifera called Dactylopora, which belong to the Tertiary period. Receptaculites is a still more complex organism. It has a THE BEGINNING OF LIFE ON THE EARTH. 39 sack-like form, often attaining a large size, and the double walls are composed of square or rhombic plates, connected with each other by hollow tubes from which proceed canals perforating the plates (Fig. 25). This curious structure is confined to the Siluro-Cambrian, and is so dissimilar from modern forms that its affinities have been subject to grave doubts.
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To quickly assess the difficulty of the text, read a short excerpt:
After Billings.
a, Aperture. B, Inner wall. C, Outer wall. , Nucleus, or primary chamber. Z>, Internal cavity.
with spicules ; but these I have ascertained to be merely acci- dental, and will be referred to in the next chapter. The true structure of Archseocyathus consists of radiating calcareous plates enclosing chambers connected by pores. Archaeocyathus came in with the Later Cambrian, and seems to have died out in the Siluro- Cambrian. The only more modern things which at all resemble it ar...e the Foraminifera called Dactylopora, which belong to the Tertiary period. Receptaculites is a still more complex organism. It has a THE BEGINNING OF LIFE ON THE EARTH. 39 sack-like form, often attaining a large size, and the double walls are composed of square or rhombic plates, connected with each other by hollow tubes from which proceed canals perforating the plates (Fig. 25). This curious structure is confined to the Siluro-Cambrian, and is so dissimilar from modern forms that its affinities have been subject to grave doubts.
What to read after The Chain of Life in Geological Time a Sketch of the Origin And Succession of?
You can find similar books in the "Read Also" column, or choose other free books by William James Dawson to read onlineMoreLess
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