The Evolution of Continuity in the Natural World
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In our eReader you can find the full English version of the book. Read The Evolution of Continuity in the Natural World Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Evolution of Continuity in the Natural World
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180 EVOLUTION OF THE VERTEBRATE 181 It is true that in Aurelia they all end by becoming discon- tinuous, but it requires no great effort of imagination to picture a primitive type in which the successive medusiform parts of the strobila did not separate, but were obliged to develop in close continuity, so that a series of interdependent segments was the result. Such development in close con- tinuity would in fact produce a primitive piscine organism ; and we propose to try to show how a mouth, ...gills, brain and cord, and closed circulatory system, such as possessed by the typical Fish, would be almost inevitable consequence.
It cannot be emphasised too strongly that the primitive Fish must have originated suddenly, and that its mature plan was the result of forces moulding and guiding on new lines the development of a fertilised ovum originally serially- Fig. 54. — The development of Aurelia. a, Scyphistoma ; b, further stage ; c, strobilation begins ; d, strobila ; e, free- swimming Ephyra.
What to read after The Evolution of Continuity in the Natural World?
You can find similar books in the "Read Also" column, or choose other free books by David Russell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
180 EVOLUTION OF THE VERTEBRATE 181 It is true that in Aurelia they all end by becoming discon- tinuous, but it requires no great effort of imagination to picture a primitive type in which the successive medusiform parts of the strobila did not separate, but were obliged to develop in close continuity, so that a series of interdependent segments was the result. Such development in close con- tinuity would in fact produce a primitive piscine organism ; and we propose to try to show how a mouth, ...gills, brain and cord, and closed circulatory system, such as possessed by the typical Fish, would be almost inevitable consequence.
It cannot be emphasised too strongly that the primitive Fish must have originated suddenly, and that its mature plan was the result of forces moulding and guiding on new lines the development of a fertilised ovum originally serially- Fig. 54. — The development of Aurelia. a, Scyphistoma ; b, further stage ; c, strobilation begins ; d, strobila ; e, free- swimming Ephyra.
What to read after The Evolution of Continuity in the Natural World?
You can find similar books in the "Read Also" column, or choose other free books by David Russell to read onlineMoreLess
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