

PLATE V. 



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



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



Fig. 1. Occipital 



Fig. 2. Occipital 



Fig. 3. Occipital 



Fig. 4. Occipital 



Ko. 2050) 



Fig. 5. Occipital 



Fig. 6. Occipital 



Fig. 7. Occipital 



Fig. 8. Occipital 



view of the skull of an old male from the plains of Kansas (specimen No. 1215). 



view of the skull of a male five or six jears old from Kansas (spec. No. 94). 



view of the skull of an old male from Big-Bone Lick, Kentucky (spec. No. 2047). 



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



view of the skull of a male about six years old from Kansas (spec. No. 102). 

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

 view of the skull of a male about six years old from Kansas (spec. No. 11). 

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



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