JSro. 13 CLASSIFICATION OF BIRDS WETMORE 3 



American Ornithologists' Union the form -oidea was used in the 

 original scheme but was disapproved by the committee in charge of 

 that work as a whole. To be consistent, therefore, in the complete 

 classification issued at that time, I used the Latin plurals, recommended 

 then for the A.O.U. list, for the names in question. Subsequently, 

 the committee reversed its decision, and the suffix -oidea was used in 

 the fourth edition of the A.O.U. Checklist pubHshed in 1931. The 

 same usage is here incorporated in the complete classification. 



Class Aves, Birds. 



Subclass Archaeornithes, Ancestral Birds. 



Order Archaeopterygi formes, Archaeopteryx, Archaeornis. 



Family Archaeopterygidae, Archaeopteryx. Archueor- 

 11 is (fossil). 

 Subclass Neornithes, True Birds. 



Superorder Odontognathae, New World Toothed Birds. 

 Order Hesperornithiformes, Hesperornithes. 



Family Hesperornithidae, Hesperornis, Hargeria (fos- 

 sil). 

 Enaliornithidae,* £;?a//or//;jr, Bapfornis (fossil). 

 Order Ichthyornithi formes, Ichthyornithes. 



Family Ichthyornithidae,' Ichthyornis (fossil). 

 Superorder Palaeognathae, Struthious Birds and Allies. 

 Order Struthioniformes, Ostriches. 



Family Struthionidae, Ostriches. 

 Order Rheiformes, Rheas. 



Family Rheidae, Rheas. 

 Order Casuariiformes, Cassowaries, Emus. 

 Family Casuariidae, Cassowaries. 

 Dromiceiidae, Emus. 

 Dromornithidae, Dronwrnis (fossil). 

 Order Dinornithi formes, Moas. 



Family Dinornithidae, Moas (fossil and extinct). 



Anomalopterygidae, Anomalopteryx, Emeus, 

 and Allies (fossil and extinct). 



* Position provisional. Lambrecht, Handbuch der Palaeornithologie, 1933, pp. 

 255-261, unites the formerly recognized Baptornithidae with this group, which 

 he considers closely related to the loons and grebes. 



'Lambrecht, Handbuch der Palaeornithologie, 1933, p. 585, has separated 

 Apatornis in the family Apatornithidae. This genus is here left in the Ichthyor- 

 nithidae pending further consideration. 



