PLATE IX. 
Milk Dentition of Bison americanus. (All the figures natural size.) 
Fig. 1. Right lower pre-molars seen from above, from a very young individual (the first true molar is 
just in sight). Specimen No. 590. 
Fig. 2. The same seen from the outside. 
Fig. 3. Right upper pre-molars seen from above, from the same specimen. 
Fig. 4. The same seen from the outside. 
Fig. 5. Right lower pre-molars, seen from above, from a somewhat older specimen, in which the first true 
molar is fully in sight. Specimen No. 1153. 
Hig. 6. The same, seen from the outside. 
Fig. 7. Right upper pre-molars, seen from above, from a specimen of about the same age as No. 1153. 
Drawn from specimen No. 1155. 
Fig. 8. The same, seen from the outside. 
