ODONTOLCAE. 



459 



united. The teeth are found all along the lower jaw, but are confined 

 to the maxilla in the upper jaw. The palatal structure is not fully 

 known, but there are no basipterygoid processes ; the head of the 

 quadrate is single. The vertebral centra are saddle-shaped, and the 



no. 251.-Hesperorms regalis, i. V. Cretaceous, Kansas (from S. Woodward, after 



Marsh). 



bones of the pelvis are free posteriorly. There is no pygostyle Ena^ 

 liornis from the Cambridge Greensand, and Bapiorms from the Worth 

 American Cretaceous are probably here. 



The so-called Stereornithes include a number of large extinct land birds, 

 the skeletons of which have been foimd in the lower Tertianes of South 



* Andrews, Ibis, 1896, p. 1. Lydekker, Ibis, 1893, p. 40, and Dictionary 

 of Birds, p. 904. 



