430 



THE EYE IN EVOLUTION 



Fig. 536. — The Platypus, Orsithorhtxchus (tVoin Burton's Story of Animal 

 Life, Elsevier Pub. Co.). 



>'A1 . — The Echidna, TACHraLOssun (from Burton's Slory of Aitmuil 

 Life, Elsevier Pul). f"o.). 



