32 ELEMENTARY SKETCH OF THE OSTEOLOGY OF BIRDS. 



Plate II. 



(EXPLANATION.) 



Pig, 1. — Under view of skull of Common Fowl, to show 

 Schizognathous modification ; enlarged 1^ dia- 

 meters. 



j'ig. 2. — Upper view of same skull. 



"Pig, 3. — Under view of skull of Ardea cinerea, to show Des- 

 mognathous modification. 



Y\g. 4. — Under view of skull of Corvus corax, to show ^gi- 

 thognathous modification. 



Fio'. 5.— Under view of skull of Drom<sus novcB-hollandiee, to 

 show Dromaeognathous modification. 



bo. basi-occipital. pa. parietal, 



b.pt. basi-pterygoid process. pf. post-orbital process of fron- 

 b.sph. basi-sphenoid. tal. ^ 



en. occipital condyle. pi. palatine, 



eo. ex-occipital. p.mx. pre-maxilla. 



eth. ethmoid. pt. pterygoid, 



eu. eustachian opening. qj. quadrato jugal. 



f.m. foramen magnum. qu. quadrate, 



fr. frontal. so. supra-occipital, 



m.xp. maxillo-palatine process, sph. r. sphenoidal rostrum, 

 na. nasal. sq. squamosal, 



n.pmx. nasal process of pre- vo. vomer, 

 maxilla. 

 Figures 1 and 2 are copied from the article '^ Birds" in 

 '^ Encyclopsedia Britannica^' (figs. 19 and 20); the other three 

 are copied from Professor Huxley's paper on the classification of 

 Birds published in the Proceedings of the Zoological Society 

 of London for April 1867 (figs, 3, 25, 32.) 



