THE HIPPOPOTAMUS. 



147 



aquatic creature, and accordingly has preserved 

 the completeness of hand and foot, the four toes 

 almost fully developed. In Fig. 20 we have the 

 root and middle portion of the right fore-foot, and 

 we will here use the terms generally given to this 

 part of the skeleton in Man and the higher 



FIG. 20. Hippopotamus, Eight Fore-foot. After Kowalewsky. 



vertebrates : s (scaphoideum) = radiale ; I (lunatum) 

 = intermedium ; p (pyramidale) = ulnare ; t (trape- 

 zoideum) = carpale 2 ; m (magnum or capitatum) = 

 carpale 3 ; u (uncinatum) = carpalia 4 + 5. 



A one-toed hippopotamus in the natural course 

 of development is an impossibility. The gradual 

 reduction of the toes, as already said, can be con- 



