Archive image from page 112 of The dinosaur book the The dinosaur book : the ruling reptiles and their relatives dinosauruli13colb Year: 1945 a torpedo, or a submarine. So it was that the ichthyosaurs became fishlike because they lived like fishes. In a like manner, the modern porpoises are fishlike, even though they are warm-blooded mammals, because they live like fishes. Yet underneath the skin the animal gives himself away. The ichthyosaur skeleton is reptilian through and through; the porpoise skeleton and the details of its soft anatomy are mammalian through and through. The ichthyosau
Archive image from page 112 of The dinosaur book the The dinosaur book : the ruling reptiles and their relatives dinosauruli13colb Year: 1945 a torpedo, or a submarine. So it was that the ichthyosaurs became fishlike because they lived like fishes. In a like manner, the modern porpoises are fishlike, even though they are warm-blooded mammals, because they live like fishes. Yet underneath the skin the animal gives himself away. The ichthyosaur skeleton is reptilian through and through; the porpoise skeleton and the details of its soft anatomy are mammalian through and through. The ichthyosaur came from land-living reptiles, probably certain cotylosaurs. The porpoise has come from land-living mammals, prob- ably from certain carnivorous types. The course of evolution has been reversed; the The aquatic Sauropterygians. Nothosaurus, a Trias- sic form, was partially terrestrial and partially aquatic. Elasmosaurus was a Cretaceous plesiosaur. Placodus was a Triassic mollusk-eater Restorations by John C. Germann
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