morgan-tallmon.] A Fossil Egg from Arizona. 



40!) 



specimen presents, then, one of the very few instances, possibly 

 the only one, in which conclusive evidence is at hand to connect 

 bituminous matter with the original material from which it has 

 been derived by a natural process without abnormal conditions. 



Measurements. 



Length of egg 62 mm. 



Width " » 40 



Circumference (longitudinally) 169 



" (transversely) 124 



Long diameter of enclosing capsule 120 



Average thickness of enclosing capsule 12 



Thickness of egg shell .33 



