450 REFERENCES TO THE PLATES. 



PLATE II. 



IIy^^'^nodon crucians. Sec page 48. Figures of the natural size. 



Fig. 1. View of the riglit siJe of a skull, with both of the jaws containing full series of molar teeth. 



Fig. 2. Upper view of the greater portion of a skull, from another specimen. 



Fig. 3. Inferior view of the same specimen. 



PLATE III. 



HviENODON noREiDus. Seo page 39. 



View of the left side of a skull, with the jaws containing nearly all the teeth. Of the natural size. 



PLATE IV. 



DRErANODON PEiMiEVUS. See page 54. Figures of the natural size. 



Fig. 1. View of the right side of a skull, without the lower jaw. It contains all the teeth except one 

 incisor and the first premolar. 



Figs. 2-4. From a young but mature individual. 



Fig. 2. Series of the upper molars of the right side, unworn. 



Fig. 3. View of the triturating surface of the last or tubercular molar. 



Fig. 4. Portion of the right ramus of the lower jaw, containing all the molar teeth unworn. 



Fig. 5. Nearly complete skull of an old individual, as conspicuously indicated by the much worn 

 condition of the upper sectorial tooth. 



PLATE V. 



All the figures of the natural size. 



Figs. 1-4. DiNiCTis FELiNA. See page 64. 



Fig. 1. View of the right side of a nearly complete skull, containing all the molars and the lower 

 canine perfect. 



Fig. 2. Portion of the right ramus of the lower jaw, from another specimen, exhibiting a comj)lete 

 series of molars. 



Fig. 3. Inferior view of the right upper sectorial and tubercular teeth. 



Fig. 4. Posterior view of the right upper tubercular tooth. 



Fig. 5. Deepanodon occidentalis. See page 63. 



Fragment of the left ramus of a lower jaw, containing the second premolar, and the fangs of the 

 molars before and behind. (Erroneously indicated as in Plate IV, on page 63.) 



Figs. 6-9. Amphicyon gracilis. See page 36. 



Fig. 6. Upper view of the facial portion of a skull. 



Fig. 7. Lateral view of the same specimen, with the sectorial tooth and succeeding tubercular molar. 



Fig. 8. Under view of the right alveolar border of the same specimen. 



Fig. 9. Fragment of the left ramus of the lower jaw, containing the last premolar, the sectorial 

 tooth, and the succeeding pair of tubercular molars. 



Figs. 10, 11. HYiENODOU CRUEXTUS. See page 47. 



Fig. 10. Portion of the left ramus of a lower jaw, containing the third and fourth premolars, the 

 principal sectorial molar, and remains of other teeth. 



Fig. 11. Outer view of the upper last or sectorial molar of the left side, from a different individual 

 than the preceding. 



