PLATE X 



SKULL OF Acratocnus odontrigonus 



Fig. 1. — Lateral aspect of rostral portion (11/3 X nat. size). 



Fig. 2.— Doi'sal aspect of rostral portion (1 1/3 X nat. size). 



Fig. 3. — Internal aspect of left mandible (approxhuately nat. size). 



Fig. 4. — External aspect of left mandible (approximately nat. size). 



Fig. 5. — Internal view of broken anterior portion of right mandible (approxi- 

 mately nat. size). 



Fig. 6. — Median symphysial portion of mandible, showing alveoli of c^anines 

 nearly meeting at base (approximately nat. size). 



