TABLE X. 



REMAINS OF ARCH.EOTHERIUM AND OKEODON OF THE EOCENE TEKTIARY OF NEBRASKA. 



Engraved from Dagueri'eolypes of the Original Specimens. 



Ta.h. X., Fig. i. Inrerior view of the upper jaw of ArcluBOllicriwn {Entdodonf) Moiioni, one-half the diameter of nature. 

 > - Upon the upper side of the figure may be observed the last two temporary molars, and the succeeding 



two permanent molars, and on the lower side the permanent premolar successors of the former teeth, 

 and the following two true molars. 

 " Fig. 2. Side view of the head of Ari-hceothcrmm (Entdodon f) Mortoni, reduced two diameters. In it are visible 

 tlie posterior two temporary molars, and the first and second permanent true molars. 

 The lower jaw exhibits a portion of the unprotrnded last permanent premolar, a fragment of the last 

 temporary molar, and the first permanent true molar. 

 " J'ig. 3. Portion of the left side of the lower jaw of jlrdtceothcrmm [Enidodon?) Mortoni, reduced one diameter. 



It contains a portion of the last temporary molar, below which, in the figures, the unprotrnded last 

 permanent premolar is partially visible, and the permanent true molars. 

 Since writing the descriptions accompanying these plates, on the mammalian and ehelonian remains 

 of Nebraska, I have had an opportunity of inspecting Gervai's Pateontologie Fran^aises, in which is the 

 sketch of an upper series of molar teeth of Entelodoii, which so closely correspond to those of Archeeo- 

 therium, that 1 think it very probable the latter may prove to belong to the same genus. 

 " Figs. 4-6. Oreodon Cidbertsonii, reduced one diameter. 



" Fig. 4. Inferior view of the skull, of a male individual, containing on both sides the molar series, ahnost perfect, 

 the left canine tooth entire, and part of the right canine. 



" Fig. 5. Side view of the skull, with the lower jaw, of a female individual. It contains all the molar teeth in both 

 jaws, and the canines in the lower ja"w. 



" Fig. 6. Upper view of the skull of the same individual as the last. ■ - • ^ 



The Archseollierium partook of the nature of the Hog and Peccary. Yet, by regarding its physiognomy, 

 it will be observed that the animal must have had more decided carnivorous propensities than those 

 pachyderms ; indeed, in the greater size of the temporal fossse and high sagittal crest, this fossil genus 

 of Nebraska, approximated to the Cat tribe ; and it is probable, when its canine teeth are discovered, 

 that they will be found to have an analogy v/ith the plantigrade or Bear tribe. Thus we have united in 

 this singular extinct race characters witnessed now in two different orders. 

 The Oreodon was truly a ruminating Hog ; its grinding teeth closely analogous to the Deer tribe, 

 show that it chewed the cud like existing Ruminants, yet was provided with very peculiar canines, more 

 like those of the Peccary than any other existing animal ; while some portions of the cranium approach 

 to the Camel and Lama. It possesses incisors in both jaws, difiering in this respect from all existing 

 Ruminants. 



