"Of the existence of Mammals before the Trias we have no evidence, either in the New or the Old World, and it is a significant fact that at essentially the same horizon in each hemisphere similar low forms of Mammals make their appearance. Although only a few incomplete specimens have been discovered, they are characteristic and well preserved, and all are apparently marsupials; the lowest mammalian group known in America, living or fossil. The American Triassic mammals are known at present only from two small lower jaws, on which has been founded the genus Dromotherium, supposed to be related to the insect-eating Myrmecobius, now living in Australia. Although the fauna of Europe have yielded other similar mammals for the Oolite, America has as yet none of this class from that formation, while from the rocks of cretaceous age, no mammals are known in any part of the world."
[255] P. 118.
[256] P. 105.
[257] Le monde des plantes avant l'apparition de l'homme, p. 34.
[258] Genesis of Species, p. 129.
[259] Charles Darwin, p. 185.
[260] Genesis of Species, p. 130.
[261] Types of Animal Life, 149.
[262] Genesis of Species, p. 132.
[263] "Primeval Vegetation in its relation to the Doctrine of Natural Selection and Evolution" (Essays and Addresses, Owen's College, Manchester, p. 251).