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 which 
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 (Antilocapra 
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. 
e 
Sreconp GROUP OF 5 
F ROUP EIGH ER. 
wan NiGiiH ODE: First Group oF THE EIGHTH ORDER 
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Group of the Eighth Oraer. of the Eighth Order. 
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the Second Di-| of the Second} the First Di-| First Division 
vision of the} Divisionof the] vision of the] of the First 
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the Eighth Or-| the Highth Or-| the Eighth Or-| Eighth Order. 
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If, however, we look to the feet as a means of classifying the 
ruminants, we should be obliged to make important changes in 
