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 '. 

 Hub. North America. 



Fig. 30. 



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

 Wyomirg, U.S.A. ^V (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. G. Marsh, 1885. 



Tinoceras longiceps, Marsh 2 . 

 Hub. 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. Eep. U S. Geol. Surv. p. 261 (1884). 



2 Fifth Ann. Kep. U. S. Geol. Surv. p. 275 (1884). 



