
STRUTHIONIFORM ES. 47 
Suborder 34. RHE‘. 
The Rheas may be diagnosed as follows :— 
A. The keel of the sternum has become obsolete. B. The length of the humerus is 
more than the combined length of six dorsal vertebre. C. Hallux absent; second, 
third, and fourth digits present, and directed forwards. D. Basipterygoid pro- 
cesses present, and articulating with the pterygoids as near the quadrates as 
















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The Rhez appear to differ from all the other Struthioniformes in haying the maxillo- 
palatines free from the vomer, ; 
