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Updated: June 12, 2025
We might then dwell more on their resemblances to lower types to rodents, to insectivora, and to marsupials, and should hardly rank the hideous baboon above the graceful leopard or stately stag.
And I am greatly disposed to look for the common root of all the Ungulata, as well, in some ancient non-deciduate Mammals which were more like Insectivora than anything else. On the other hand, the Edentata appear to form a series by themselves.
Besides these there are thirteen Rodents and four Insectivora, including a shrew-mouse and six squirrels, whose unaided passage over twenty miles of sea is even more inconceivable than that of the larger animals. But when we come to the cases of the same species inhabiting two of the more widely separated islands, the difficulty is much increased.
In Austro-Columbia, the later Tertiary fauna exhibits numerous and varied forms of Platyrrhine Apes, Rodents, Cats, Dogs, Stags, Edentata, and Opossums; but, as at present, no Catarrhine Apes, no Lemurs, no Insectivora, Oxen, Antelopes, Rhinoceroses, nor Didelphia other than Opossums.
The capitan settled the matter by driving the whole party into the corral, for the wild stallions would not leave the mares." Male animals which are provided with efficient cutting or tearing teeth for the ordinary purposes of life, such as the carnivora, insectivora, and rodents, are seldom furnished with weapons especially adapted for fighting with their rivals.
Among the twelve or fourteen species of Mammalia which are said to have been found in the Purbecks, not one is a member of the orders Cheiroptera, Rodentia, Ungulata, or Carnivora, which are so well represented in the Tertiaries. No Insectivora are certainly known, nor any opossum-like Marsupials.
The total Miocene fauna comprises many genera and species of Catarrhine Apes, of Bats, of Insectivora; of Arctogaeal types of Rodentia; of Proboscidea; of equine, rhinocerotic, and tapirine quadrupeds; of cameline, bovine, antilopine, cervine, and traguline Ruminants; of Pigs and Hippopotamuses; of Viverridoe and Hyoenidoe among other Carnivora; with Edentata allied to the Aretogaeal Oryeteropus and Manis, and not to the Austro-Columbian Edentates.
This order is now divisible into seven families, of about equal systematic value: the first, the ANTHROPINI, contains Man alone; the second, the CATARHINI, embraces the old-world apes; the third, the PLATYRHINI, all new-world apes, except the Marmosets; the fourth, the ARCTOPITHECINI, contains the Marmosets; the fifth, the LEMURINI, the Lemurs from which 'Cheiromys' should probably be excluded to form a sixth distinct family, the CHEIROMYINI; while the seventh, the GALEOPITHECINI, contains only the flying Lemur 'Galeopithecus', a strange form which almost touches on the Bats, as the 'Cheiromys' puts on a rodent clothing, and the Lemurs simulate Insectivora.
But the Cheiroptera are extreme modifications of the Insectivora, just as the Cetacea are extreme modifications of the Carnivorous type; and therefore it is to my mind incredible that monodelphous Insectivora and Carnivora should not have been abundantly developed, along with Ungulata, in the Mesozoic epoch.
The terrestrial Carnivora and Insectivora rarely exhibit sexual differences of any kind, including colour. Desmarest, 'Mammalogie, 1820, p. 220. The marine Carnivora or seals, on the other hand, sometimes differ considerably in colour, and they present, as we have already seen, other remarkable sexual differences.
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