O. C. Marsh — Restoration of Coryphodon. 325 



Restoration of Coryphodon hamatus. 



After the above brief review of the more important litera- 

 ture relating to the coryphodont mammals found in America, 

 the main object of the present article, the restoration of one 

 species of Coryphodon, may be considered. In Plate VI, this 

 restoration is given, one-twelfth natural size. The position 

 shown was chosen after careful consideration, and is believed 

 to represent fairly one naturally assumed by the animal in 

 life, when standing at rest. The figure represents a fully adult 

 individual of one of the largest species of the genus, which, 

 when alive, was nearly six feet in length, and about three feet 

 in height. 



The basis of this restoration is the type specimen of Coryph- 

 odon hamatus, and this was supplemented by other remains 

 which appeared to be specifically identical. A large number 

 of such specimens were available, some of them in excellent 

 preservation. For parts of the skeleton where such remains 

 were wanting, specimens from nearly allied forms were used, 

 but no serious error can thus result. In these remains, the 

 caudal vertebrae were seldom preserved in good condition, 

 and although a sufficient number of such specimens from dif- 

 ferent individuals were at hand, the exact number in the 

 present species could not be determined, and hence the vertebrae 

 of the tail are left in outline. 



No clavicles are represented in the restoration, and no evi- 

 dence of their existence has been found by the writer in the 

 many remains investigated. The specimens described by Prof. 

 Cope as clavicles of Coryphodon probably do not pertain to 

 that genus. A bone very similar in shape to the supposed 

 clavicles was figured by him as the fifth metatarsal, in the first 

 diagram he published of the hind foot of Coryphodon. The 

 same figure has three phalanges in the first digit, and the ecto- 

 cuneiform supported mainly by the astragalus ; features not 

 seen elsewhere by the writer. 



The feet of Coryphodon. 



The structure and position of the feet of Coryphodon, as 

 represented in the restoration, require some consideration in 

 this connection, in view of differing opinions on these points. 

 The fore feet of Coryphodon were first figured and described 

 by the writer, and on Plate V, figure 1, is the original cut 

 then published. This figure was made from a well-preserved 

 specimen in which both fore feet were present, and nearly in 

 position when found. They were carefully kept in the matrix 

 until prepared for the drawing, and hence the accuracy of the 

 figure cannot well be questioned. The fore feet represented 



