35 



Measurements of the Teeth-. 



M, 



Total length of a superior incisor 057 



Length crown (inner face) superior incisor 015 



Width " (oblique) " " 020 



" " " inferior " 023 



Length " (inner face) " " 018 



Width canine .030 from tip 020 



' ' posterior molar 039 



Length " 028 



Elevation posterior crest do 016 



Width anterior true molar * . . .035 



" premolar 028 



Length " 0215 



". (first) 016 



Width " 008 



Length " (inferior) 024 



Width " " 020 



" penultimate lower molar .023 



Length " " " 037 



It is not certain that the last named species of Bathmodon does not be- 

 long to this genus. All three are distinct from the M. armatus, the lat- 

 ter though young, being considerably larger than BatJmwdon latipts, 



APPENDIX. 



The materials on which the preceding determinations are based, were 

 obtained by the Geological Surveys conducted during 1871-2, by Prof. F, 

 V. Hayden, U. S, Geologist, 



The papers descriptive of fossils from the Wyoming basin published by 

 the writer during the jjear 1872, were issued at the following dates : 



On Bathmodon, an extinct genus of Ungulates, February 16th. 



On a new genus of Pleurodira from the Eocene of Wyoming, July llth. 



On the Tertiary coals and fossils of Osino, Nevada, July 29th. 



Descriptions of some new Vertebrate from the Bridger Group of the 

 Eocene, July 29th. 



Second account of new Vertebrata from the Bridger Eocene, August 3d. 



Third account of new Vertebrate from the Eocene of Wyoming Terri- 

 tory, August 7th. 



On the existence of Dinosauria in the Transition beds of Wyoming, 

 near August 12th, 



Notice of Proboscidians from the Eocene of Southern Wyoming, 

 August 19th, 



Notices of new Vertebrat.a from the upper waters of Bitter Creek, Wy- 

 oming Territory, August 20th, 



Second notice of extinct Vt'rtttw.tes from Bitter Creek, Wyoming, 

 August 22d. 



On the Dentition of Metalophodon, September 2()th- 



