140 HORN-STRUCTURES IN THE UNGULATA. 



much to resemble that of the teeth of mammals, which begin 

 to be solidified at the top, and after the completion of the 

 body of the tooth, the fangs or roots are developed. It 

 seems difficult to correlate this mode of growth in the prong- 

 buck with that observed in the rest of the Bovidse, in which 

 all the increase takes place at the root only. 



