O. C. Marsh — Restoration of Coryphodon. 323 



skull and the brain-cast, given by the writer first in 1876, and 

 again in 1877, is repeated below, figure 1. 

 c In another publication (this Journal, vol. xiv, p. 354, 1877), 

 the writer defined more fully the horizon in the lower Eocene 

 in which the Coryphodontidce had been found in this country, 

 and named the deposits the Coryphodon beds. 



Figure 1. — Outline of skull and brain-cavity of Coryphodon hamatus, Marsh; 

 top view. About one-fifth natural size. 



The most important publication of Prof. Cope on the 

 Coryphodontidce will be found in Volume IV of the Wheeler 

 Survey, published in 1877. The remains of a number of dif- 

 ferent forms, mainly from New Mexico, are described and 

 figured, and the relations of the group to some allied mammals 

 are discussed. In the following year, Prof. Owen published 

 again on Coryphodon, in the Annals and Magazine of Natural 

 History (vol. ii, p. 216, 1878), giving figures of some American 

 forms. In various papers, Prof. Cope subsequently referred 

 to the Coryphodontidm, naming several supposed species and 

 two genera, Manteodon and Ectacodon. but adding little 

 of importance to what was already known of the group. In 

 his volume on " The Yertebrata of the Tertiary Formations of 

 the West," 1881, he again discusses at length the Coryphodon- 

 tidm, and gives a number of new figures. The historical part, 

 pp. 513-517, is marred by many errors, characteristic examples 

 of which may be seen in two footnotes, pp. 513 and 516. The 

 statements there made are erroneous, as has already been 

 shown in the present article. 



In his monograph on the Dinocerata, 1884, the writer dis- 

 cussed the various relations of the Coryphodontidm to the 

 Dinocerata, giving figures of the skull and brain-cast, the 

 upper and lower molar teeth, and the feet, of Coryphodon 

 hamatus. The name Amblydactyla was substituted for 

 Amhlypoda, and Coryphodontia for Pantodonta, the names 

 replaced both being essentially preoccupied. 



