No. 2.] THE HARD PARTS OF THE MAMMALIA. 205 
the irregularity of those positions also forbids the latter idea, 
and adds to the probability that the arteries which furnished the 
deposit of phosphate of lime were contained in a superficial 
dermal coating. The supposition is also strengthened by the 
fact that the only existing Ruminants (the giraffes) with per- 
manent horns without horny sheaths have them covered with 
hairy skin. 
“Tt appears that in the antlers of Cosoryx the deposit of a 
burr was immediately associated with the death of the portion 
of the horn beyond it, so that it disintegrated and disappeared. 
This was not the case 
with the beam in the 
specimens observed. 
Nevertheless it is 
probable that the 
death of the horn 
would be associated 
with the deposit of 
the burr in this case 
also, were the condi- 
tions the same. What 
those conditions were 
we can only surmise. 
It was very probably 
the death of the in- 
tegument which _ in- 
vested and nourished 
the horn that pro- 
duced that result; 
and this would more 
readily occur in the Z@ 
exposed antlers than 
in the more protec- . 
ted basal portion of 
the beam. It is very 
probable that this re- ad 
sult would follow Figure 43.— 1, 2, Cosoryx necatus Leidy; 7, with- 
blows and laceration out, 2, with, burr on antler; 3, 4, Cosoryx ramosus 
Cope; 3, antler broken and reunited; 4, beam with 
of the surface re- burr; two-thirds nat. size; original; from Report U. 
ceived during com- §, G. G. Expl. 1ooth Mer., G. M. Wheeler. 
