PLATE V. 



Pleistocene Hippopotamus. 

 Hippopotarrms amphibius. 



Chiefly Permanent Dentition. 

 (All two-thirds natural size.) 



a = Anterior end of tooth. 



Fig. 



1 . Fragment of right maxilla with m. 2 and 3 little worn, outer side. (S.) 



2. Left m. 1 , worn, inner side. (B.M.) 



3. Right pm. 1 , unworn, inner side. (S.) 



4. Left pm. 2, unworn, outer side. (S.) 

 •5. The same tooth, oral aspect. 



6. Right pm. 3, inner side. (B.M.) 



7. Right pm. 4, unworn, inner side. (S.) 



8. Right pm. 4, somewhat worn, oral aspect. (S.) 



9. Right m. 3, unworn, inner side. (S.) 



10. Right m. 2, rather worn, inner side. (S.) 



11. Right m. 1, a good deal worn, inner side. (B.M.) 



12. Right m. 1, unworn, oral aspect. (B.M.) 



13. Right pm. 4, unworn, inner side. (S.) 



14. Left pm. 3, oral aspect. (S.) 



15. Right pm. 3, unworn, inner side. (S.) 



ll). Right p.m. 2, slightly worn, inner side. (S.) 



17. Palatal view (natural size) of anterior end of mandible of a newborn hippo- 

 potamus showing the milk-dentition in position. The germ of d.i. 3 is visible. 

 This specimen is no. 1873 in the catalogue of the Museum of the Royal 

 College of Surgeons. 

 With the exception of no. 17, which is a recent specimen, all the above are 



from the river gravel of Barrington, near Cambridge. Those marked " S." are 



preserved in the Sedgwick Museum, Cambridge; those marked "B.M." in the 



British Museum. 



