In order to set the theory of genetic Evolution upon a sound and substantial basis, it is not sufficient to show that the last ungulate is lineally descended from the first,-Equus from Eohippus, hyracotherium, Phenacodus, or Hippops,-but that this first ungulate himself-whichever it was-has been, or at least may have been, similarly developed from a non-ungulate Mammalian ancestor, the common parent of all the protean forms assumed by his progeny.
"The Old Riddle and the Newest Answer"
John Gerard
Some of these have been referred by Professor Owen to an opossum, and others to the genus hyracotherium.
"The Student's Elements of Geology"
Sir Charles Lyell
And if, for example, we were to call the hyracotherium a Hyrax beast it would not be a name, but a description, and not a bit more intelligible.
"Animals of the Past"
Frederic A. Lucas