ATTEN Dis. 
Art. XI. — Principal Characters of the Coryphodontide ; by 
Professor O. C. MarsH. With plate IV. 
tiary Mammals, and mark a definite geological horizon in this 
Kuropean specimens. 
The identification of the American remains with the genus 
Coryphodon of Owen, and the determination thereby of a definite 
horizon, common to the two countries, and containing the 
oldest known Tertiary Mammals, was published by the writer 
In ge 1876, and subsequently in the following number of 
ournal (vol. xi, p. 425.)§ - j 
The Museum of Yale College contains a large collection of 
phodon remains from Utah, Wyoming, and New Mexico, 
and this material is amply sufficient to indicate all the more 
important characters of the group. Among these specimens are 
portions of the same individuals described by Cope under the 
hames Bathmodon and Loxolophodon,| both of which are syno- 
BA ms of Coryphodon, as the remains on which they were based 
Clearly belong to that genus. One of the species best repre- 
sented in the Yale collection is Coryphodon hamatus Marsh, and 
this has afforded many of the characters given below. 
*This Journal, vol. xi, p. 428, May, 1876. 
{Anat Fossil Mammals and Birds, p. 299 
Scien re 
p. 2 
des les, tome vi, p. 87, 1856. 
Fe en turalist (vol. xi, ah ‘of. Cope has rece ly claimed 
= 8 di very on of a paper which he read before the Spring Meeting 
~ cademy, in 1876. He knew, however, at the time that my article 
W: 
"Y Publication was in the room, in the hands of a member. 
I Proceedings American Philosophical Society, 1872, p. 420. 
Am. Jour. Sct.—Turrp Serres, VoL. XIV, No. 79.—Juty, 1877. 
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