ANSERES 



467 



pterygoids are placed so far forwards that the anterior ends 

 of those bones articulate with them. 



F> 



Pax 



, 



l-'iii. 2'24. SKULL OF Quo'^it^iliiln crecca. LATEKAL VIEW. 



(AFTEI; HUXLEY.) 

 /'.. frontal : Set, nasal : I'm.i; i>renia.\illa : I'n. voiuer : l'. palatine: I't. i>ter\ -^niii. 



The vomer is a thin deepish plate of bone which is more 

 or less intimately connected with the 

 median septum and maxillo-palatines in 

 front. The maxillo-palatines are com- 

 pletely fused across the middle line in 

 many Anseres (e.g. Clicn, Hijin,'iin],nnus} ; 

 in Biziura and Neryus they come into 

 contact but are not fused. The latter 

 has very un-ducklike palatine in that the 

 somewhat delicate maxillo-palatines diverge 

 from each other after their junction pos- 

 teriorly as well as anteriorly, the palatine 

 vacuity in front being (for a duck) un- 

 usually extensive. In CJtcii <'a'ritl.<'sc<'iix, 

 indeed, secondary bony growths have 

 almost completely obliterated this vacuity, 

 a kind of ' false ' palate having been 

 formed. 



The lacrymal bones are large, having 

 a considerable length of line of union with 

 the skull ; they are sometimes (e.g. Chloe- 

 pliaya) and sometimes not (e.g. Mertjux} 

 ankylosed with the orbital margin. Cere- 

 opsis has (among the genera which I have examined) a skull 



H II 1? 



Fin. 225. VENTRAL 

 VIEW OF SAME. 



M.i'fi. inaxilln-iiiiLitiiies. 

 Other IrtUTsasiuti^. -'-'4. 



