HIGH SCHOOL ZOOLOGY. 



133 



zoologists regard them as degenerate forms of carinato birds, 

 which have iii the course of ages lost the power of flight, while 

 others, looking at their s-lructure and theLr geographical distri- 

 bution, think that they are a more primitive gi'oup than the 

 Carinatje with more affinity to the reptiles, and that they never 

 possessed the power of flight. The plumage in this group never 



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Fist. 95. —Skeleton of the Moa (DinorniH). 



