Journal of Mammalogy 
Published Quarterly by the American Society of Mammalogists 
VoL. 2 • FEBRUARY, 1921 No. 1 
RESEMBLANCES AND CONTRASTS BETWEEN ZOOLOGIC 
AND PAL^ONTOLOGIC RESEARCH IN MAMMALOGY. 
DESIRABILITY OF UNIFORM STANDARDS AND SYSTEMS 
IN CLASSIFICATION, IN DESCRIPTION, IN MEASURE- 
MENT, IN REASONING! 
By Henry Fairfield Osborn 
In submitting this paper the author presented a model of the skull 
of Eotitanops gregoryi, the diminutive Eocene ancestor of all the titan- 
otheres; a fossil skull of Palwosyops major, an extremely short-headed 
titanothere; a fossil skull of DoUchorkinus hyognathus, an extremely 
long-headed titanothere; also, for comparison, recent skulls of a broad- 
headed bulldog and of a long-headed greyhound. He further sub- 
mitted recent papers by several leading mammalogists, namely, Messrs. 
Allen,^ Merriam,^ Osgood,^ and his own memoirs on the “Systematic 
Revision of the Equidae”^ and the “Craniometry of the Equidae,”® 
as examples of resemblances and contrasts in palaeontologic and zoologic 
methods. 
1 Paper presented by the author, under this title, at the meeting of the Society, 
May 3, 1920, in the American Museum of ISTatural History. 
^ Allen, J. A. Ontogenetic and Other Variations in Muskoxen, with a Sys- 
tematic Review of the Muskox Group, Recent and Extinct. Mem. Amer. Mus. 
Nat. Hist., N. S. vol. I, part IV, March, 1913. 
3 Merriam, C. Hart. Review of the Grizzly and Big Brown Bears of North 
America. North American Fauna, no. 41, February 9, 1918. 
^ Osgood, Wilfred H. Revision of the Mice of the American Genus Peromys- 
cus. North American Fauna, no. 28, April 17, 1909. 
® Osborn, H. F. Equidse of the Oligocene, Miocene, and Pliocene of North 
America, Iconographic Type Revision. Mem. Amer. Mus. Nat. Hist., N. S. vol. 
II, part 1, May, 1918. 
® Osborn, H. F. Craniometry of the Equidse. Mem. Amer. Mus. Nat. Hist., 
N. S. vol. I, part 3, June, 1912. 
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JOURNAIi OF MAMMALOGY, VOL. 2 , NO. 1 
