196 ZOOTOMY. 



with a facet on the inner edge of the corresponding quadrate, 

 and passing inwards and forwards to the rostrum, a small 

 facet on its inner surface articulating with the basiptery- 

 goid process ( 49). 



63. The palatines (pi), large paired bones passing for- 

 wards from the anterior ends of the pterygoids : their poste- 

 rior ends are scroll-like, their anterior ends slender and free 

 in the young bird, but ankylosed in the adult with the 

 maxillae ( 67). 



64. The vomer, a small median bone, lying between the 

 palatines at the anterior end of the parasphenoid. 



65. The lacrymal (lc), a considerable bone forming the 

 anterior wall of each orbit, and articulating above with the 

 corresponding frontal. 



66. The premaxillae (pmx), paired bones forming the 

 greater part of the beak, and completely ankylosed with one 

 another in the adult : the anterior or free ends of the united 

 bones form the strong pointed extremity of the beak, from 

 which three processes are given off on each side : the first 

 of these, the nasal process, passes upwards and back- 

 wards on the dorsal aspect of the beak, fused with its 

 fellow of the opposite side, to join the anterior edge of the 

 frontals; the palatine process extends backwards and 

 slightly outwards on the ventral aspect of the beak, and is 

 fused in the adult with the corresponding palatine ; and the 

 maxillary process passes backwards and outwards, 

 external to the palatine process, forming the edge of the 

 beak, and uniting posteriorly with the maxilla. 



67. The maxillae (MX), continuing backwards the max- 

 illary processes of the premaxillce, to which they are anky- 

 losed in the adult : anteriorly the inner edge of each is 

 produced into an inwardly-directed, spongy mass of bone, 

 the maxillopalatine process (inxp), which is ankylosed 



