PLATE 8 
Costal surface of the left clavicle and the tibial surface of the left fibula; 
about two-thirds natural size. 
Figs. 25 and 35. No. 210, Castor canadensis phaeus. 
Figs. 26 and 37. No. 12101, Castor canadensis leucodonta. 
Figs. 27 and 34. No. 19229, Castor fiber. 
Fig. 28. No. 8869, Castor subauratus. 
Figs. 29 and 33. No. 16385, Castor subauratus. 
Fig. 30. No. 8987, Castor subauratus. 
Fig. 31. No. 12654, Castor subauratus. 
Fig. 32. No. 12668, Castor subauratus. 
Fig. 36. No. 4347, Castor canadensis belugae. 
Note that the angle which the hamular process makes with the shaft of the 
fibula is greater in subauratus and fiber than in canadensis; that the shafts of 
the clavicles of subauratus are curved, in canadensis and fiber they are straight; 
that the fossa near the dorsal edge is deeper in fiber and subauwratus than in cana- 
densis. 
[106] 
