rZNTATHERIID^. 



181 



is horizontal, the cervical vertebrae short, and the lunar does not 

 articulate with the trapezoid ; the mandibular flange in some forms 

 (woodcut, fig. 29) is almost absent ; the fronto-parietal protuberances 

 are frequently of large size (woodcut, fig. 29). 



Tinoceras ingens, Marsh 1 . 



Hah. Xorth America. 



Fig. 30. 



Tinoceras ingens. — The restored skeleton ; from the Bridger Eocene of 

 Wyoming, U.S.A. Vo- (From the 'American Journal.') 



M. 2061. Cast of the cranium. The original is from the Bridger 

 Eocene of Wyoming, U.S.A. ; and is figured by Marsh in 

 his ' Monograph of the Dinocerata/ pis. xv.-xviii. 



Presented by Professor 0. 0. Marsh, 1885. 



Tinoceras longiceps, Marsh 2 . 



Ilab. North America. 



M. 2094. Cast of the mandible and the upper canine. The original 

 is from the Bridger Eocene of Wyoming, U.S.A. ; and is 

 figured by Marsh in the 'Monograph of the Dinocerata,' 

 p. 37, fig. 38. Presented by Professor 0. C. Marsh, 1885. 



1 Fifth Ann. Rep. U. S. Geol. Surv. p. 2G1 (1884). 

 - Fifth Ann. Rep. U. S. Geol. Surv. p. 275 (1884). 



