STRUTHIONIFORMES. 49 
Suborder 36. STRUTHIONES. 
The Ostriches may be diagnosed as follows :— 
A. The keel of the sternum has become obsolete. B. Second digit lost. 
To this diagnosis many other characters may be added :— 
C. The length of the humerus is more than the combined length of six dorsal vertebre. 
D. Cervical vertebre more than 19 in number. 











































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| The arrangement of the palatal bones in the Struthiones is unique; the vomer is not 
| prolonged backwards to articulate either with the palatines or the pterygoids. 
