It is true that the elephants are generally considered to form a group apart from both the odd and the even-toed Ungulata.    From Wordnik.com.  [On the Genesis of Species] Reference

Author that the giraffe has powers of locomotion and endurance fully equal to those possessed by any of the other Ungulata of that continent.    From Wordnik.com.  [On the Genesis of Species] Reference

Even the very earliest Ungulata show this distinction, which is completely developed and marked even in the Eocene palæotherium and anoplotherium found in Paris by Cuvier.    From Wordnik.com.  [On the Genesis of Species] Reference

Ungulata higher than the Quadrumana or the Carnivora.    From Wordnik.com.  [Contributions to the Theory of Natural Selection A Series of Essays] Reference

Apparently singular as is the elephant in its anatomy, it bears traces of affinity to both Rodentia and Ungulata.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference

Parsimony analysis of total evidence from extinct and extant taxa and the cetacean-artiodactyl question (Mammalia, Ungulata).    From Wordnik.com.  [ScienceBlogs Channel : Life Science] Reference

It can thus obtain food beyond the reach of the other Ungulata or hoofed animals inhabiting the same country; and this must be a great advantage to it during dearths.    From Wordnik.com.  [VII. Miscellaneous Objections to the Theory of Natural Selection] Reference

The Ungulata or hoofed quadrupeds are now divided into the even-toed or odd-toed divisions; but the Mærauchenia of S. America connects to a certain extent these two grand divisions.    From Wordnik.com.  [XI. On the Geological Succession of Organic Beings. On the Affinities of Extinct Species to Each Other, and to Living Forms] Reference

Insectivora and Marsupials than the Carnivora or the Ungulata, as shown among other characters by the Opossums possessing a hand with perfect opposable thumb, closely resembling that of some of the Lemurs; and by the curious Galeopithecus, which is sometimes classed as a Lemur, and sometimes with the Insectivora.    From Wordnik.com.  [Contributions to the Theory of Natural Selection A Series of Essays] Reference

Ungulata eocene, 110.    From Wordnik.com.  [On the Genesis of Species] Reference

Ungulata, 25, 109.    From Wordnik.com.  [On the Genesis of Species] Reference

Ungulata, O.træa Gregaria, O. Sowerbvi, O. Subrugulosa, Perna Quardrata.    From Wordnik.com.  [Records of Woodhall Spa and Neighbourhood Historical, Anecdotal, Physiographical, and Archaeological, with Other Matter] Reference

In the writings of older naturalists this animal, so singular in its construction, will be found grouped with the horse, rhinoceros, hippopotamus, tapir, coney, and pig, under the name of pachydermata, the seventh order of Cuvier, but these are now more appropriately divided, as I have said before, into three different orders -- Proboscidea, the elephants; Hyracoidea, the conies; and the rest come under Ungulata.    From Wordnik.com.  [Natural History of the Mammalia of India and Ceylon] Reference