Hipparion

Nothing of significance had been uncovered while Louis and Boswell were at Olduvai, but two days after their return, Louis found a skull and palate of Hipparion, the three-toed horse, while Juma discovered a skull of an unknown species of giraffe at a new site nearby called Rawi.

Ancestral Passions Virginia Morell 1995

Nothing of significance had been uncovered while Louis and Boswell were at Olduvai, but two days after their return, Louis found a skull and palate of Hipparion, the three-toed horse, while Juma discovered a skull of an unknown species of giraffe at a new site nearby called Rawi.

Ancestral Passions Virginia Morell 1995

The only instance in which an approach towards a series of nearly related forms has been obtained is the existing horse, its predecessor Hipparion and other extinct forms.

On the Genesis of Species St. George Mivart

A rich mammaliferous deposit (_Hipparion_, _Rhinoceros_, _Dinotherium_, _Mastodon_, &c.) of this period has been found near Mesemvria.

Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" Various

Arguments may yet be advanced in favour of the view that new species have from time to time manifested themselves with suddenness, and by modifications appearing at once (as great in degree as are those which separate _Hipparion_ from _Equus_), the species remaining stable in the intervals of such modifications: by stable being meant that their variations only extend for a certain degree in various directions, like oscillations in a stable equilibrium.

On the Genesis of Species St. George Mivart

Unless we admit transformations as prodigious as those advocated by Mr. Mivart, such as the sudden development of the wings of birds or bats, or the sudden conversion of a Hipparion into a horse, hardly any light is thrown by the belief in abrupt modifications on the deficiency of connecting links in our geological formations.

VII. Miscellaneous Objections to the Theory of Natural Selection 1909

No one will deny that the Hipparion is intermediate between the existing horse and certain older ungulate forms.

XI. On the Geological Succession of Organic Beings. On the Affinities of Extinct Species to Each Other, and to Living Forms 1909

” For instance, he supposes that the differences between the extinct three-toed Hipparion and the horse arose suddenly.

VII. Miscellaneous Objections to the Theory of Natural Selection 1909

Hipparion and Pliohippus, of the pliocene, equalled the ass in height; while the size of the quaternary Equus was fully up to that of a modern horse.

A History of Science: in Five Volumes. Volume III: Modern development of the physical sciences 1904

The natural line of descent would seem to be through the following genera: Orohippus, of the eocene; Miohippus and Anchitherium, of the miocene; Anchippus, Hipparion, Protohippus, Phohippus, of the pliocene; and Equus, quaternary and recent.

A History of Science: in Five Volumes. Volume III: Modern development of the physical sciences 1904