The Artiodactyla. 
129 
nge follows except complication of the horns. In the 
vine group, on the contrary, the habit of shedding them 
omes fixed, and a new family has its origin. 
\o species certainly referable to Palaeomeryx or Dicro- 
js have been as yet found in North America, but they 
y be detected at any time. Numerous species have been 
id in Europe. Cosoryx is abundant in North America, 
species being known (fig. 18, C. necatus and C. ramo- 
). They vary in size from that of a gazelle to that of a 
fallow-deer. Although they did not shed their horns, some 
individuals developed a burr near the base of the beam, and 
burrs are found on the branches followed by broken down 
bone (Figs. 18, 2). In other cases broken points of antlers have 
become reattached, showing the presence of an integument 
to retain them. I have suggested that the development. of 
the burr was due to the stripping or laceration of thisintegu- 
