• Publications
  • Influence
The Edentata of North America
  • E. Cope
  • Geology
    The American Naturalist
  • 1 August 1889
TLDR
Of these divisions it is evident hat the Nomarthra are the least specialized, and must be regarded as ancestral to the Xenarthra, which are now exclusively Old World, while the Xexartkra are confined to the New World.
Observations on the Systematic Relations of the Fishes
  • E. Cope
  • Biology
    The American Naturalist
  • 1 September 1871
TLDR
The gills are now beautifully plumed and when closed reach to the centre of the entire animal; hind legs starting, June 20, fifty-six days, hind feet developed, and by the middle of August the gills have all disappeared.
The Tertiary Marsupialia
  • E. Cope
  • Geology
    The American Naturalist
  • 1 July 1884
The best test of the relations in density between molten and solidified rock is apparently to compare the density of the rock just before fusion, or at least near that point, with the density of the
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