. The origin and evolution of life, on the theory of action, reaction and interaction of energy. comparative anatomy and embryology as opposed to thetriple evidence afforded by these sciences when reinforced bypalaeontology. 174 THE ORIGIN AND EVOLUTION OF LIFE It is through the discovery of primitive types of the fringe-finned ganoids, to which Huxley gave the appropriate nameCrossopterygia, in reference to the fringe of dermal rays arounda central lobe-iin of cartilaginous rods, that the true ancestryof the Amphibia and of the amphibian limb has been is now regarded as due to a p
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. comparative anatomy and embryology as opposed to thetriple evidence afforded by these sciences when reinforced bypalaeontology. 174 THE ORIGIN AND EVOLUTION OF LIFE It is through the discovery of primitive types of the fringe-finned ganoids, to which Huxley gave the appropriate nameCrossopterygia, in reference to the fringe of dermal rays arounda central lobe-iin of cartilaginous rods, that the true ancestryof the Amphibia and of the amphibian limb has been is now regarded as due to a partial change of adaptation,. Fig. 55- Phosphorescent Illuminating Organs. The abyssal fishes represented in Fig. 54 as they are supposed to appear in the darknessof the ocean depths. . models in the American Museum of Natural History. incident to the passage of the animal from the littoral life zoneto the shore zone, whereby the propelling fin was graduallytransformed into the propelling limb. This transformationimplies a long terrestrio-aquatic phase, in which the fin waspartly used for propulsion on muddy surfaces (Fig. 53). In the reversed parallel retrogressive evolution of the lung-fishes {Lepidosiren, Gymnotus), of the fringe-finned fishes {Cala-moichthys) and of the bony fishes {Angicilla), the final eel-shaped. RISE OF MODERN FISHES 175 finless stage is through convergent adaptation either approachedor actually passed. The bony fishes (teleosts), which first emerge as a distinctgroup in Jurassic time, radiate adaptively into all the greatbody-form types whichhad been previously at-tained by the olde
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