18 



THE ANTELOPE OF AMERICA. 



Second. Those which have solid horns, or more properly, 

 antlers, which are osseous in their structure and are provided 

 with a periosteum. 



Still we find such important differences among those Avliich 

 compose each of these divisions, that we are not satisfied till we 

 further subdivide them into classes : the first division of this 

 group into 



1. Those which have hollow and persistent horns ; and 



2. Those which have hollow and deciduous horns. 



All the hollow horned ruminants have persistent horns, and so 

 are of the first class ; except the American antelope (^Antilocajjra 

 Americana) which has a hollow horn, which is shed and repro- 

 duced annually, and so is the sole representative of the second 

 class. Then, again, those which have solid horns or antlers also 

 require a further classification : — 



1. Those which have solid and deciduous antlers, which em- 

 braces all the solid horned ruminants except 



2. The giraffe, or camelopard, which alone has a persistent 

 solid horn. 



EIGHTH ORDER. 



Second Group of 

 THE Eighth Okdek. 



First Gkoup of the Eighth Ohder. 



Second Divisimi of the First 

 Group of the Eighth Orfler. 



First Division of the First Group 

 of the Eiirhth Order. 



Second Class of 

 the Second Di- 

 vision of the 

 First Group of 

 the Eiglith Or- 

 der. 



The First Class 

 of the Second 

 Division of the 

 First Group of 

 the Eighth Or- 

 der. 



Second Class of First Class of the 



the First Di- 

 vision of the 

 First Group of 

 the Eighth Or- 

 der. 



First Division 

 of the First 

 Group of the 

 Eiiihth Order. 



/~ 



If, however, we look to the feet as a means of classifying the 

 ruminants, we should be obliged to make important changes in 



