EXPLANATION OF THE PLATES. 



Fig, 26. Lower extremity of femur (articulating surface), Rhinoceros. 



The following figures all represent the bones of Ruminants. 



Fig. 27. Lower extremity of femur (articulating surface), Ox ? 



Fig. 28. Lower extremity of femur (articulating surface), Ox ? 



Fig. 29. Lower extremity of femur, articulating surface. 



Figs. SO & 31. Upper extremities of tibias. 



Figs. 32 & 33. Portions of scapula, the base of the bone. — The figures in this plate 

 are reduced one-fifth. 



Plate XLII. 



Represents remains of the genera Emys and Trionyx- 



Figs. 1 & 2. Posterior portion of the right side of the lower jaw — Trionyx ? 



Fig. 3. Internal view of a fragment of the back of a Trionyx. 



Fig. 4. External view of the same. 



Fig. 5. Internal view of the anterior portion of the sternum — Emys ? 



Fig. 6. External view of the same. 



Fig. 7. External view of a portion of the back of a Trionyx. 



Fig. 8. Internal view of the same, showing the rib. 



Fig. 9. External view of a portion of the back of a Trionyx. 



Fig. 10. Internal view of the same. 



Fig. 11. External view of a portion of the back of a Trionyx. 



Fig. 12. Internal view of the same. 



Fig. 13. Part of sternum of an Emys. 



Figs. 14 & 15. Part of scapula of an Emys ? 



Fig. 16. Part of scapula of an Emys ? 



Of the bones here figured, those represented by figs. 5, 6, 14, 15, 16 have 

 characters which justify the supposition that they belonged to the genus Emys ; 

 but the mutilated state of the specimens prevents a satisfactory conclusion on 

 this point. Those represented by figs. 5, 6, 16 probably belonged to the same 

 animal, which must have been of gigantic size. 



The bones represented by figs. 3, 4, 7, 8, 11, 12 evidently belonged to at 

 least three distinct species of Trionyx. Figs. 3, 4, 7, 8 represent portions which 

 probably belonged to the same species. In the specimen represented at fig. 1 1, the 

 rugosities are unusually prominent, and distributed with very little regularity. 



