234 



Mr. R. Broom on the 



the nostril, but two of the American Museum specimens seem 

 to indicate that the opening extends somewhat inwards and 

 forwards, and one would like to see a specimen showing 

 the perfect snout to feel quite sure that this opening is 

 the nasal opening and not perhaps also an opening for some 

 sensory organ. 



There is a small premaxilla — possibly toothed. It is 

 figured by v. Huene. The maxilla is slender and carries 

 about ten teeth. Its posterior end articulates, I believe, 

 with the palatine. It forms the floor of the nasal opening 



Fig. 1. 



Pmxi 



Restoration of the underside of skull of Lyaorophns tricarinatus, 

 Cope, x 5. 



and perhaps its posterior border. The doubt lies in the fact 

 that in the specimens it is impossible to be quite sure 

 whether the bridge of bone which connects the prefrontal 

 with the maxilla is a part of the prefrontal or a part of the 

 maxilla or a small independent bone. 



One specimen shows most of the palate. The bones are a 

 little crushed and fractured, and the interpretation I give is 

 made with some hesitation (fig. 1). Von Huene figures the 

 specimen, but his interpretation differs somewhat from mine, 



