":!4 STRUCTURE AXI) CLASSIFICATION OF 



of the fact that it existed at about the same period. Lau- 

 pteryx prisons is known from a skull fragment from the upper 

 Jurassic of Wyoming at about the same horizon as the 

 ' Atlantosaurus beds.' It was about the size of the heron 

 (Ardea lierodias). The back part alone of the skull has been 

 found, and the remains show that the head of the quadrate 

 was undivided, as in ratites (except Apteri/.r}. Close by was 

 found a single tooth which may or may not have belonged 

 to it. MAESH a considers the bird to have boon ratite in its 

 characters. 



1 ' Discovery of a Fossil Bird in tin- Jurassic of Wyoming,' Ann i'. Juiini. 

 Sci. xxi. (18S1), p. :M1. 



