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OriginNpf Aves;"Tlie birds 
probabl.^\;ordginated from 
a group of ^iaptosauri©¥ 
identioal Wither, closely 
related to that which gave 
rise to the Dinosauria.lt 
is not true that birds 
have descended from Dino- 
V # 
saurSjbut there is very 
strong evidence that birds 
and Dinosaurs are descend¬ 
ed from a common stock. 
Origin of tommals;-There 
is no question that the 
mammals are affiliated . 
with the subclass SYNAPS- 
IDA rather than with the 
DIAPSIDA.The divergence 
of the mammal stem from 
these typical 
will probably 
have occurred 
reptiles 
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