HEREDITY 



169 



Fio. 101. Diagram showing arrangement of bones in the hand or foot 

 of various animals : 1, man ; 2, gorilla ; 3, orang ; 4, dog ; 5, sea lion ; 6, 

 dolphin; 7, bat; 8, mole; 9, Ornithorhynchus. (After Haeckel.) 



