REFERENCES TO THE PLATES, 



PLATE I. 



All the figures are of the natural size, except 15 and 16. 



Figs. 1 — 6. Amphicyon vetus. See page 32. 



Fig. 1. Upper view of the cranium. 



Fig. 2. Portion of the left ramus of the lower jaw, containing the heel of the sectorial tuoth, and the 

 succeeding pair of tubercular molars. 



Fig. 3. Inner view of a right sectorial tooth of the lower jaw. 



Fig. 4. Fragment of the left side of a lower jaw with the sectorial molar, viewed externally. 



Fig. 5. Series of the three upper tubercular molars of the left side, viewed on their triturating sur- 

 faces, a, last molar ; h, penultimate molar ; c, ante-penultimate molar. 



Fig. 6. Series of the upper sectorial and the succeeding two tubercular molars of the right side, from 

 a smaller and younger individual, h, penultimate molar ; c, ante-ijenultimate molar ; d, sectorial tooth. 



Fig. 7. Amphicyon gracilis. See page 36. 



Fragment of the leftside of a lower jaw, containing the last premolar and the sectorial tooth, viewed 

 externally. 



Fig. 8. PsEUD^LURUS iNTREPiDus. See page 52. 



Left ramus of the lower jaw. a, position of an alveolus for a premolar. 



Fig. 9. Canis siEvus. See page 28. 



Fragment of the left ramus of the lower jaw from an old individual, containing the sectorial tooth 

 and succeeding molar much worn, and portions of several premolars. 



Fig. 10. Canis Haydeni. See page 30. 



Fragment of the right ramus of the lower jaw, containing the sectorial molar and the preceding pair 

 of premolars much worn, a, pair of alveoli for the last molar; h, pair of alveoli for the penultimate 

 molar. 



Fig. 11. Canis vafer. See page 29. 



Greater portion of tlie right ramus of the lower jaw, containing all the teeth except the incisors. 



Fig. 12. Canis temerarius. See page 29. 



Small fragment of the right ramus of a lower jaw, containing the sectorial tooth. 



Figs. 13, 14. .^LURODON FEROX. See jiage 68. 



Fig. 13. Outer view of the right sectorial tooth. Fig. 14. Inner view. 



Figs. 15, 16. Leptarctus primus. See page 70. One and a half diameters. 



Fig. 15. Outer view of a left upper molar tooth, probably a fourth of the series. Fig. 16. Inferior 

 view of the same. 



