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The supposition that all these types were rapidly differentiated out of Lacertilia, in the time represented by the passage from the Palaeozoic to the Mesozoic formation, appears to me to be hardly more credible, to say nothing of the indications of the existence of Dinosaurian forms in the Permian rocks which have already been obtained.
But I suppose his mother believed there was a hell, for at such times, when from weariness he was less of an evil beast than usual, the old-fashioned horror would inevitably raise its dinosaurian head afresh above the slime of his consciousness; and then even his wife, could she have seen how the soul of the man shuddered and recoiled, would have let his brutality pass unheeded, though it was then at its worst, his temper at such times being altogether furious.
In the leaping kangaroo and jerboa a shortening of the arms and lengthening of the legs appear. Here the arms are relieved from duty and a double duty is laid on the legs, with the consequence stated. In the ancient dinosaurian reptiles, upright walkers, the same was the case.
But now comes the further inquiry, Where was the highly differentiated Sauropsidan fauna of the Trias in Palaeozoic times? The supposition that the Dinosaurian, Crocodilian, Dicynodontian, and to Plesiosaurian types were suddenly created at the end of the Permian epoch may be dismissed, without further consideration, as a monstrous and unwarranted assumption.
Where was the highly differentiated Sauropsidan fauna of the Trias in Palaeozoic times? The supposition that the Dinosaurian, Crocodilian, Dicynodontian, and Plesiosaurian types were suddenly created at the end of the Permian epoch may be dismissed, without further consideration, as a monstrous and unwarranted assumption.
As the name implies, this group includes most of the colossal animals, such as the Diplodocus, which the illustrated magazine has made familiar to most people. * See, besides the usual authorities, a valuable paper by Dr. R. S. Lull, "Dinosaurian Distribution" .
Both were plainly dinosaurs, with the lizard tail and hind-legs; but the lesser of the two, with its square, powerful head and tiger-fanged jaws, and the tremendous, rending claws on its short forearms, was plainly of a different species from the great herb-eaters of the dinosaurian family.
As to birds, the only notable instance in which discoveries recently made appear to fill up an important hiatus, is the interpretation given by Professor Huxley to the remains of Dinosaurian reptiles, and which were noticed in the third chapter of this work.
The supposition that all these types were rapidly differentiated out of Lacertilia in the time represented by the passage from the Palaeozoic to the Mesozoic formation, appears to me to be hardly more credible, to say nothing of the indications of the existence of Dinosaurian forms in the Permian rocks which have already been obtained.
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