E. L. Troxell — Amynodonts in Marsh Collection. 33 



Measurements of Holotypes. 



A. A. A. 



erectus antiquus intermedins 

 sp. nov. (Scott & Osborn)Osborn 

 1883 1890 



mm. mm. mm. 



Skull : Length 350 



Length of molar-premolar series . 145 187 



Length of molar series 96 104 



Diameters of upper teeth : 



P^ ant.-post 20 22 



P^, transverse 32 33 



M^ ant.-post 28 37 44 



MS transverse 39 37 43 



M^ ant.-post 37 45 53 



M^ transverse 42 37 52 



M^ ant.-post 36 28 46 



M^ transverse 38 30 46 



Lower jaw : 



Length, incisor to angle 356 



Width, body of ramus 45 



Depth of ramus below Mg 74 



Length of premolar series 46 80 



Length of molar-premolar series . . 142 



Same without M,, 104 165 



Length of molar series 98 



Diameters of lower teeth : 



Ij, transverse 13 9 



Ig, transverse 10 



Ci, ant.-post 18 15 31 



Diastema, Ci to premolar 34 40 



Po, ant.-post 10 19 15 



Pg, ant.-post 15 23 21 



P„ ant.-post 22 29 ^ 26.5 



P^, transverse 16 17 ' 18 



Ml, ant.-post. 29 37 35 



M„ transverse 19 24 22 



Mg, ant.-post 34 44 46 



M2, transverse 23 . 24 



Mg, ant.-post. 38 47? 



Mg, transverse 20 24 



Meferences. 



Abel, O. 1914. Die A^orzeitlichen Saugetiere. Jena. 



Marsh, O. C. 1875. Notice of new Tertiary mammals. This Journal (3). 



9, 239-250. 

 —1877. New vertebrate fossils. Ibid. (3), 14, 249-256. 

 — 1884. Dinocerata. Mon. U. S. Geol. Survey, 10. 



Am. Joue. Sci.— Fifth Series, Vcl. II. No. 7.— Jfly, 1921. 



