160 CASTOR. 
Measurements. Total length, 1070; tail vertebrz, 360; scaly por- 
tion of tail 290125; hind foot, 185. Skull: occipito-nasal length, 
134; Hensel, 122; zygomatic width, 97; interorbital constriction, 22; 
Fig. 30. CASTOR C. FRONDATOR. 
No. 35883 U.S. Nat. Mus. Coll. Type. 
palatal length, 78; length of nasals, 46; length of upper molar series, 
32; length of mandible, angle to alveolus of incisors, 96; height at 
condyle, 22; at coronoid process, 52. 
