OUR FACE FROM FISH TO MAN 



early mammals with the very active respiration 

 of carnivorous animals. 



The anti-evolutionists may be interested to 

 learn that at a very early stage of its development 

 the human embryo (Fig. 65) passes through a stage 

 in which the olfactory capsules, like those of sharks, 

 have no internal opening on the palate but are 



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man 



OLFACTORY 

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Fig. 65. Earlt Embhtonic Stages in the Development of the 

 Nose in Man (after Keith). 



merely extended backward and downward toward 



the mouth. Later (Fig. 66) the choanae, or internal 



openings of the olfactory capsules, develop in the 



fore part of the roof of the mouth, but there is only 



the beginning of a secondary palate and the 



conditions in the reptiles (Fig. 66B) are recalled 



(Keith, Corning). 



In this connection Keith (1921, pp. 158, 159) 



summarizes the evolution of the human face as 



follows : 



120 



