O’Leary, M. A. 1996. Dental evolution in the early Eocene
Notharctinae (Primates, Adapiformes) from the Bighorn
Basin, Wyoming: Documentation of gradual evolution in
the oldest true primates. Ph.D. dissertation, The Johns Hopkins
University, Baltimore.
———. 1998. Phylogenetic and morphometric reassessment of
the dental evidence for a mesonychian and cetacean clade;
pp. 133–161 in J. G. M. Thewissen (ed.), The Emergence of
Whales. Evolutionary Patterns in the Origin of Cetacea.
Plenum Press, New York.
———. 1999. Parsimony analysis of total evidence from extinct
and extant taxa, and the cetacean-artiodactyl question.
Cladistics 15:315–330.
O’Leary, M. A., and J. H. Geisler. 1999. The position of Cetacea
within Mammalia: Phylogenetic analysis of morphological
data from extinct and extant taxa. Systematic Biology 48:
455–490.
O’Leary, M. A., and K. D. Rose. 1995. Postcranial skeleton of the
early Eocene mesonychid Pachyaena (Mammalia: Mesonychia).
Journal of Vertebrate Paleontology 15:401–430.
O’Leary, M. A., and M. D. Uhen. 1999. The time of origin of
whales and the role of behavioral changes in the terrestrialaquatic
transition. Paleobiology 25:534–556.
O’Leary, M. A., S. G. Lucas, and T. E. Williamson. 2000. A new
specimen of Ankalagon (Mammalia, Mesonychia) and evidence
of sexual dimorphism in mesonychians. Journal of
Vertebrate Paleontology 20:387–393.
Oliveira, E. V., and L. P. Bergqvist. 1998. A new Paleocene armadillo
(Mammalia, Dasypodoidea) from the Itaboraí Basin,
Brazil. Asociacion Paleontologica Argentina Publicacion
Especial 5:35–40.
———. 1999. A new Paleocene armadillo (Mammalia, Xenarthra,
Astegotheriini) from Itaboraí, Brazil, and phylogeny of early
Tertiary astegotheriines. Anais da Academia Brasileira de
Ciências 71:814–815.
Osborn, H. F. 1898a. Remounted skeleton of Phenacodus primaevus.
Comparison with Euprotogonia. Bulletin of the American
Museum of Natural History 10:159–164.
———. 1898b. Evolution of the Amblypoda. Part I. Taligrada
and Pantodonta. Bulletin of the American Museum of Natural
History 10:169–218.
———. 1904. An armadillo from the middle Eocene (Bridger) of
North America. Bulletin of the American Museum of Natural
History 20:163–165.
———. 1918. Equidae of the Oligocene, Miocene, and Pliocene
of North America, iconographic type revision. Memoirs
of the American Museum of Natural History, new series
2:1–330.
———. 1924. Andrewsarchus, giant mesonychid of Mongolia.
American Museum Novitates 146:1–5.
———. 1929. The titanotheres of ancient Wyoming, Dakota,
and Nebraska. Two volumes. U. S. Geological Survey
Monograph 55(1–2):1–953.
Osborn, H. F., and W. Granger. 1931. Coryphodonts of Mongolia,
Eudinoceras mongoliensis Osborn, E. kholobolchiensis sp.
nov. American Museum Novitates 459:1–13.
———. 1932. Coryphodonts and uintatheres from the Mongolian
expedition of 1930. American Museum Novitates 552:1–16.