[ 108 ] 64 



Cuvier. Established upon the greater portion of a face and lower jaw 

 containing all the molares. There were^also in the collection several frag- 

 ments of jaws with teeth, and an entire i; tibia, of several other individuals 

 of the same species. 



2. Rhinoceros occidentalis, Leidy : ih. 119, 276. A species little 

 more than half the size of R. indicus. Founded upon a fragment of the 

 lower jaw with the posterior molar tooth, fragments of nine superior mo- 

 lares, two entire inferior molares, and fragments of several others. 



Of Palajotherium three species are indicated : 



1. Pal^otherium Proutii, Owen, JYorwood and Evans : ih. 66 ; 

 Leidy : ih. 122. This is an enormous species of Palaiotherium far sur- 

 passing any previously described, and approaching the elephant or mastodon 

 in size. It was first discovered and described* by Dr. Hiram A. Prout of 

 St. Louis. The specific name was incidentally given as above referred. 



2. Pal^otherium Bairdii, Leidy : Proc. Acad. Nat. Sciences, vol. 

 V. p. 122. A species about two-thirds the size of Palsotherium crassum, 

 Cuvier, established upon a cranium with a portion of the face containing 

 the true molares; and all the superior and inferior molares with portions of 

 the jaws of a second individual ; and several fragments of a lower jaw of 

 a younger individual. The species is named in honor of Prof. S. F. Baird, 

 of the Smithsonian Institution. 



Arch^otherium is a remarkable genus of Pachydermata, which, as 

 since ascertained by the inspection of a fragment of a face containing 

 several true molares, in the possession of Dr. David D. Owen, of Indiana, 

 is closely allied to Hyracotheriura, Owm. 



ARCHiEOTHERiUM MoRTONi, Leidy : ih, 92. This species was founded on 

 a fragment of a face containing the third and fourth premolar and the 

 alveolus for the first true molar of the left side. 



It is named in honor of Dr. S. G. Morton, late President of the Academy 

 of Natural Sciences of Philadelphia. 



PcELUOTHERiuM, is a genus of Ruminantia allied to Dorcatherium, Kaup. 



Pgeluotherium Wilsoni, Leidy : ih. iii, 322. Established upon nearly 

 the whole anterior portion of a cranium with the lower jaw, containing all 

 the molares. 



The species is named in honor of Dr. T. B. Wilson, of Philadelphia. 



The genera Oieodon, Merycoidodon, Eucrotnphus, and probably Agrio- 

 chcerus, form members of a family of Ruminant Pachyderms, characterized 

 by the teeth forming a closed arch in both jaws with the following formula: 

 inc. I can. | pre mol. :J mol. |. 



1. Oreodon priscum, Leidy : ih. v, 238 ; ih. 276. A s])ecies about the 

 size of a common sheep, founded upon the greater portions of six crania, 

 one of which upon one side contains all the teeth of both jaws in a perfectly 

 entire condition. There are also in the collection fifteen fragments of jaws 

 with teeth of several other individuals. 



2. Oreodon gracile, Leidy: ih. 239. A much smaller species than the 

 preceding, founded upon the greater part of the superior and inferior max- 

 illoe, containing the molares. 



* Fragments of both sides of a lower jaw containing the posterior three molares, an en- 

 tire superior molare and several fragments of others of one individual, and the posterior in- 

 ferior molare (mutilated) of a second, have been kindly loaned by Dr. Frout for further 

 description. • 



