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PLATE VIII. 



Horns of Bison americanus and B. antiquus. (One third natural size.) 



Figs. 1-5. A series of the horns of the male Bison americanus^ showing variation in size and form with age. 

 (Fig. Ij from a specimen about six months old ; Fig. 2, from a specimen about one year old ; Fig. 3, 

 from a specimen about three or four years old ; Fig. 4, from a specimen about ten or twelve years old ; 

 Fig. 5, from a specimen twenty to twenty-five years old.) 



Figs. 6 and 7. Horns of very old males of B. americanus^ showing diversity in size and form in males of 

 corresponding ages. 



Fig. 8. Horn of a six-year-old female of B. americanus. 

 Fig. 9. Horn of a six-year-old female of B. honasus. 

 Figs. 10 and 11. Kottlb o£ old iemales of B. americanus. 



Fig. 12. Horn of B. antiquus (male ?), from fet Michaels, Alaska. (Specimen presented by W. G. W. 

 Harford, Esq., Director Cal. Acad, Sciences.) 



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