TABLE X. " 



HKMAINS OK AUCH.EOTIIERIUM A.NM) OREOHON Of TUK KOCENE TEKTIARy OF NEBRASKA. 



Kiigruvcd from Da.^ucircotype.s ofllio Original SpuiMiuciis. 



Tab. X.. Kig. I. luCerior view oi" tlie iipi)er jaw of Jlrrhceothcriuni (^Entclodoti f) Moiioni, one-half the diameter of iiaimf. 

 Upon the upper side of the figure may be observed the last two temporary molars, and the succeediii;; 

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

 and the following two true molars. 

 I''ig. 2. Side view of the head of Jlrchceotlicrium (Entclodon?) Morioni, reduced two diameters. In it are visible 

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

 Tlie lower jaw exhibits a portion of the unprotruded last permanent premolar, a fragment of the last 

 temporary molar, and the first permanent true molar. 



" Fig. ^. Portion of the left side of the lower jaw of Archaotheriwn [Entclodon?) Mortoni, reduced one diameter. 

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

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

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

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

 sketcli of an upper series of molar teeth of Entclodon, w-liich so closely correspond to those of Archa-o- 

 tlierium, that I think it very probable the latter may prove to belong to the same genus. 



" Figs. 4-G. Orcodon Culbcrtsonii, reduced one diameter. 



'• Fig. 4. Inferior view of the skull, of a male individual, containing on both sides the molar series, almost perfect, 

 the left canine tooth entire, and part of tlie 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 jaw. 



'• Fig. fi. Upper view of the skull of the same individual as the last. 



The Archipotherium 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 foss.e 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 with the plantigrade or Bear trioe. 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, differing in this respect from all existing 

 Ruminants. 



