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PLATE VI. 



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Skulls of Bison americanus, males, showing tlie great diversity of form that obtains in adult individuals 



of the same sex. (One fourth natural size.) 



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in profile of the skull of an old male fcom the plains of Kansas (specimen No. 1215). 

 in profile of the skull of a male five or six years old from Kansas (spec. No. 94). 

 Fig. 3. View in profile of the skiill of an old male from Big-Bone Lick, Kentucky (spec. No. 2047). 



Fig. 1. View 

 Fig. 2. View 



Fig. 4. View 



No. 2050). 

 Fig. 5. View 

 Fig. 6. View 



in profile of the skull of a middle-aged male from Big-Bone Lick, Kentucky (spec 



in profile of the skull of a male about six years old from Kansas (spec. No. 103). 

 in profile of the skull of an old male from Kansas (spec. No. 10). 



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Fig. 7. View in profile of the skull of a male about six years old from Kansas (spec. No. 11). 



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Fig. 8. View 



in profile of the skull of a male four or five years old from Kansas (spec. No. 100). 



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