The book The Evolution of Continuity in the Natural World was written by author David Russell Here you can read free online of The Evolution of Continuity in the Natural World book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Evolution of Continuity in the Natural World a good or bad book?
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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.
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