III. EXTINCT SPECIES OF AMEKICAN OX. 19 



Admeasurements. 



From middle line of os frontis to tip of horn-core 12 inches, 6 lines. 



Length of horn-core 9 " 



Distance between the bases of the horn-cores . 6 " 



Circumference at base of " 8 " 6 " 



Greatest breadth of head at the supra-orbitar margins 6 " 4 " 



From occipital condyle to lachrymal margin of orbit 8 " 6 " 

 Greatest height from basilar process to summit of os 



frontis 7 " 



Length of temporal fossa ...... 6 " 



With the same collection of bones which contained the specimen just described, 

 there is preserved a small metacarpal bone, which I suspect to belong to the same 

 species. It is of the right foot, is an adult specimen, and has the following mea- 

 surements : 



Length anteriorly 7 inches. 



Breadth of proximal articulation . . . . 2 " 4 lines. 



distal " 2 " 5 " 



Circumference at middle . 3 " 11 " 



REFERENCES TO THE PLATES. 



PLATE I. 



Figs. 1, 2. A portion of the cranium and left horn-core of Bison latifrons, one-fourth the diameter of 



nature. 



Fig. 1. Upper view of the specimen. 

 Fig. 2. Posterior view of the specimen. 



PLATE II. 



Fig. 1. Posterior view of the right horn-core of Bison antiquus, one-third the diameter of nature. 



Figs. 2 7. Molar teeth of Bison latifrons, the size of nature. 



Fig. 2. Inner view of the second superior true molar of the left side. 



Fig. 3. View of the masticating surface of the same tooth as the last. 



Fig. 4. Inner view of the last superior true molar of the left side. 



Fig. 5. Outer view of the last inferior true molar of the left side. 



Fig. 6. Outer view of a much worn last inferior molar of the left side. 



Fig. 7. Masticating surface of the same specimen as the last. 



