40 THE VERTEBRATE SKELETON. 



CLASS II. AYES 1 . 



Subclass (I). ARCHAEORNITHES. 

 Archaeopteryx. 



Subclass (II). NEORNTTHES. 



Order 1. RATITAE. 

 Group .flSpyornithes. 



Group Apteryges. Apteryx kiwi. 



Group Dinornithes. Moas. 



Group Megistanes. Casuarius cassowary. 



Dromaeus emeu. 



Group Rheornithes. Rhea American ostrich, 

 Group Struthiornithes. Struthio ostrich. 



Order 2. ODONTOLCAE. 

 wrornis. 



Order 3. CARINATAE. 



Group Iehthyomithiforrn.es. 



I chiliy or nis. 



Apatornis. 



Odontopteryx. 



Group Colymbiformes. 

 Subgroup Colymbi divers. 



Group Sphenisciform.es. 



Subgroup Sphenisci penguins. 



1 This classification of birds is essentially that of Gadow and Selenka 

 in Bronn's Classen und Ordnungen des Thier-reichs, Band vi., Abth. iv., 

 Vogel. Leipzig, 1891. 



