182 T7NQULATA. 



Genus DINOCERAS, Marsh '. 



Including Octotomus, Cope 2 . 



Dentition : (usually) I. ?, C. \, Pm. |, M. f. 



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 latieeps, Cope 4 . 

 Hob. North America. 



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

 Eocene of Wyoming; and is figured by Marsh in the 

 ' Monograph of the Dinocerata,' pi. xiii. 



Presented by Professor 0. C. Marsh, 188&. 



Dinoceras mirabile, Marsh '. 



Syn. UintatJierium mirabile, Cope 6 . 



The mandible is unknown. 



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

 mens were obtained from the Bridger Eocene of Wyoming, and 

 are figured in Marsh'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 vertebrae. 



M. 2077-81. Casts of four ribs. 



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

 27, 1872). 



Amer. Nat. vol. six. p. 44 (1885). 



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



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



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



Rep. U. S. Geol. Surv. Terr, for 1872, p. 581 (187-3). 



