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PLATE VII. 



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Figures of three skulls of Bison americanns, females, showing the great diversity of form that obtains in 

 adult specimens of the same sex. Also figures of a skull of Bison bonasus, female, and of metatarsal 

 bones of Bison americanus and B. latifrons 1 (Skulls, one fourth natural size ; metatarsal bones, 

 one third natural size.) 



Fig. L Occipital view of a skull of a female B. americanus, about six years old, from Kansas (specimen 

 Ko. 105). 



Fig. 2. Occipital view of a skull of a female B, americanus, about six years old, from Kansas (spec. 

 No. 12). 



Fig. 3. Occipital view of a skull of a female B. americanus, about six years old, from Big-Bone Lick, 

 Kentucky (spec. No. 2059). 



Fig. 4. View in profile of a skull of B. americanus, female, about six years old, from Kansas (spec. 

 No. 105). 



Fig. 5. View m profile of a skull of B. americanus, female, about six years old, from Kansas (spec. 

 No. 12). 



Fig. 6. View in profile of a skull of B. americanus, female, about six years old, from Big- Bone Lick, 

 Kentucky (spec. No. 2049). 



Fig. 7. Occipital view of a skull of J5. honasus, female, about six years old (spec. No. 1790). 

 Fig. 8. View in profile of the same. 



Fig. 9. Metatarsal bone of _B. americanus, female (spec. No. 12). 

 Fig. 10. Metatarsal bone oi B. americanus, male (spec. No. 10). 



Fig. 11. Metatarsal bone of B. latifrons'? from Darien, Ga. (The original specimen described by Dr. 

 Leidy, now in the Museum of the Boston Society of Natural History.) 



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