CONTENTS ■ XI 



Pigure Page 



751. Diagram illustrating the principle of tetraplasy 838 



752. Accelerated elongation of the limbs in the young zebra and guanaco 846 



753. Femur of dog, normal and as modified by amputation or congenital absence of fore limb 847 



754. Brachydactyly and dolichodactyly 848 



755. Examples of dwarfing due to removal or abnormal functioning of certain glands 848 



756. Theoretic selection of fluctuations of proportion 849 



757. Extinction of archaic mammals 853 



758. Affinities and duration of nine families of Perissodactyla 854 



759. Influence of secular desiccation on archaic and modern orders of mammals 866 



760. Brain proportions in Eocene perissodactyls, an artiodactyl, and an amblypod 882 



761-797. See Appendix. 



