The former of these has the toes odd (perissodactyle), the other has them even (artiodactyle).
"On the Genesis of Species" by St. George Mivart
Is the animal an artiodactyl or a perissodactyl?
"A Guide for the Study of Animals" by Worrallo Whitney
Thus the Artiodactyles have nineteen of these vertebrae, and the Perissodactyles as a rule twenty-three.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
In the Miocene the evolution of the two-toed artiodactyl foot was well-nigh completed.
"The Elements of Geology" by William Harmon Norton
The Artiodactyls comprise two groups, the Ruminants and Non-ruminants.
"Elementary Zoology, Second Edition" by Vernon L. Kellogg