182 



Genus DINOCER AS, Marsh '. 



Including Octotomus, Cope 2 . 



Dentition : (usually) I. 5, C. -j, Pm. |, M. ?. 



The base of the upper canine is nearly vertical, the cervical 

 vertebrae are longer than in. Tinoceras, and the lunar articulates 

 with the trapezoid. 



Dinoceras laticeps, Marsh 3 . 

 Syn. Octotomus laticeps, Cope 4 . 

 Hob. North America. 



M. 2060. Cast of the mandible. The original is from the Bridger 

 Eocene of Wyoming ; amd is figured by Marsh iu the 

 ' Monograph of the Dinocerata,' pi. xiii. 



Presented by Professor 0. C. Marsh, 1885. 



Dinoceras mirabile, Marsh 5 . 



Syn. Uintatherium mirabile, Cope 8 . 



The mandible is unknown. 



Hob. North America. The originals of all the following speci- 

 mens were obtained from the Bridger Eocene of Wyoming, aud 

 are figured in Maish's ' Monograph of the Dinocerata.' All the- 

 casts were presented by Professor 0. C. Marsh, 1885. 



M. 2058. Cast of the cranium. 



M. 2059. Cast of the brain-cavity. 



M. 2072-76. Casts of the bones of the fore limb. 



M. 2081-83-89. Casts of the bones of the hind limb. 



M. 2087-88. Cast of the left astragalus and calcaueum. 



M. 2062-71. Casts of the anterior vertebrae. 



M. 2082. Cast of the sacrum. 



M. 2090-91. Casts of two caudal vertebras. 



M. 2077-81. Casts of four ribs. 



1 Amer. Journ. ser. 3, vol. iv. p. 344 (for Oct., published in advance Sept. 

 27, 1872). 



2 Amer. Nat. vol. xix. p. 44 (1885). 



3 Amer. Journ. ser. 3, vol. vi. p 301 (Oct. 1873). 



4 Amer. Nat. vol. lix. p. 52 (1885). 



5 Amer. Journ. ser. 3, vol. iv. p. 344 (Oct. 1872). 



6 Rep. U. S. Geol. Surv. Terr, for 1872 r p. 581 (1873^ 



