400 



ZOOLOGY 



SECT. 



Division B. Carinatee. 



Neornithes in which, with the exception of some flightless species, 

 the sternum has a keel, the coracoid and scapula are not ankylosed, 

 the acrocoracoid and usually the furcula are well developed, and 



FIG. 1064. Hesperornis regalis. The restored skeleton. (After Marsh.) 



the coraco-scapular angle is less than a right angle. There is a 

 pygostyle around which the rectrices are arranged. The quadrate 

 usually articulates with the skull by two facets. The barbs of the 

 feathers have booklets. 1 



1 Except, perhaps, in Hesperornis. 



