TEACHODONTID^. 



243 



Pig. 49. 



Orthomerus dolloi. — The right femur ; from the Maastricht beds. £. A, 

 posterior ; B, inner aspect ; C, proximal extremity (restored) ; B, distal 

 extremity of another specimen. It, inner, pt, proximal trochanter ; a, 

 anterior, p, posterior condyles. (From the ' Quart. Journ. Greol. Soc.') 



Genus TRACHODON, Leidy 1 . 



Syn. Hadrosaurns, Leidy 2 . 



The type genus. All the dorsal vertebrae opisthoccelous, with low 

 arches, on which the rib-facet rises to the summit of the neural 

 platform ; centra moderately compressed, wedge-shaped, with haemal 



1 Proc. Ac. Nat. Sci. Philad. vol. viii. p. 72 (1850, vol. dated 1S57). 



2 Ibid, for 1858, p. 215 (1859). 



b2 



