130 ON ANTILOCAPRA AMERICANA. 



a slight constriction, and is movable on this part in a slight degree from 

 side to side. 



Fig. 3. 



Horn of Prongbuck, one month after the shedding of the old horns : ^ nat. size. 



** Fig. 3 shows the condition of the horns to-day (November 16), exactly 

 four weeks after the shedding took place. As will be seen, the horns 

 have 'grown rapidly, and have already acquired a characteristic inward 

 curve. The hair-covered ' pedicel ' and the black apical part still retain 

 their original character unaltered ; and all the increase of length in the 

 horn is due, as far as I can make out, to the lengthening-out of the 

 ' node ' (to use a botanical term), which is marked off as a slight con- 

 striction on the fresh horn (vide fig. 2). The horn above the ' pedicel ' 

 is still slightly movable on this latter part, which is still markedly warm 

 to the touch, particularly in its upper half, just below the annular con- 

 P. Z. S. 1880, striction which separates the two parts of the horn. It is here, I am 

 p. 543. inclined to believe, that the new formation of horn is going on, the 



apical, harder part being pushed, by the growth of new matter, further 

 and further away from the pedicel. I may add that the ' snag' or * prong ' 

 is not yet visible, but may be felt as a slight eminence at the base of the 

 * pedicel,' close to the skull, on the anterior margin of the horn. 



" On making a longitudinal vertical section of a horn of AntUocapra, 

 I find that there is a more or less open canal in the substance of the 



