

GALLIFORMES, 41 
Suborder 30. PYGOPODES. 
The Grebes and the Divers may be diagnosed as follows :— 
A. Cnemial process of tibia produced forwards to a remarkable degree. B. Posterior 
processes of the ilium approximated to such an extent that the sacrum is almost 
entirely concealed. ©. Spinal feather-tract not defined on the neck. D. Palate 
schizognathous. 
It is probable that the combination of characters A and B is diagnostic, and that the 
rharacter B is unique. 














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The Pygopodes consist of two families :— 
Colymbide.—No ankylosed yertebre in front of the ankylosed sacral vertebra ; median 
xiphoid process of sternum projecting behind the lateral processes. Ambiens and 
femoro-caudal muscles present. Number of cervical vertebrae 14 or 15. 
Powicipide.—Ankylosed sacral yertebree preceded by a free vertebra, in front of which 
are four ankylosed dorsal vertebra ; median xiphoid process of sternum abruptly 
truncated, so that the lateral processes extend behind it. Ambiens and femoro- 
caudal muscles absent. Number of cervical vertebrae 17 to 21. 
