XIII 



PHYLUM CHORDATA 



503 



long, coarse hairs, or with a tuft of such specially developed hairs 

 at the extremity. A mane of similar large hairs usually runs 



Fig. 1117, bis. Hippopotamus (Hippopotamus amphiOiut), (From the Cambridge Natural 



History.) 



FIG. 1118. Burchell's Zebra (Equus burchelti). (From the Cambridge Natural History.) 



along the dorsal surface of the neck. There is a wart-like 

 callosity above the wrist, and in the true Horses a second a little 

 below the heel or " hock," 



