48 CLASSIFICATION OF BIRDS. 
Suborder 35. CASUARII. 
The Emus and the Cassowaries may be diagnosed as follows :— 
A. The keel of the sternum has become obsolete. B. Tho vomer coalesces with the 
maxillo-palatines. ©. Length of humerus less than the combined length of three 
dorsal vertebree. 
This diagnosis may be strengthened by the addition of other characters :— 
D. Hallux absent; second, third, and fourth digits present, and directed forwards. 





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The Casuarii differ from the Rhew in the arrangement of the palatine bones ; the yomer 
articulates with the maxillo-palatines in front. They also differ from the Struthiones 
in this character: the yomer articulates both with the palatines and with the pterygoids 
behind. 
