EXPLANATION OF PLATE XXVII. 



Figs. 1, 2. HiPPOSYUS FOIiMOSUS : 



Au upper luolar tootb, probably tbo seoouil true molar of tbo loft sido, maguified tbroe 



diameters. 

 Fig. 1. Outer view of the crown. 

 Fig. 2. View of the triturating surface. 



Figs. 3, 4. Wash.\kius insignis : 



Fig. 3. Portion of tbo rigbt ramus of tbo lower jaw, containing tbo last two molars, magni- 

 fied three diameters. 

 Fig. 4. View of tbo triturating surfaces of the teeth, magnified eight diameters. 



Fig. 5. HYOP.SODUS MINUSCULOS : 



View of tbo triturating surfaces of the last premolar and the molars of the left side, m.agni- 

 fied four diameters. 



Figs. G-10. UixTACyoN edax : 



Fig. C. Right side of the lower jaw, containing the intermediate three premolars, part of the 

 first molar, and the second molar, natural size. 



Figs. 7-10. The teeth, magnified three diameters. 



Fig. 7. Triturating surface of tbo second molar. 

 Fig. 8. Outer view of the same tooth. 

 Fig. 9. Upper view of the premolars. 

 Fig. 10. Outer view of the same. 



Figs. 1 1-13. UlNTACYON VORAX : 



Fig. 11. Fragment of the left side of the lower jaw, containing part of the first molar and 



the second molar, natural size. 

 Fig. 12. lTi>per view of the secoud molar. 

 Fig. 13. Oater view of the second molar. 



Figs. 14, 15. Mysops featernus : 



Fig. 14. Eight side of lower jaw, with tbo last three molars, maguified two diameters. 

 Fig. 15. View of the triturating surfaces of tbo molars, magnified eight diameters. 



Figs. 16-18. Paramys delicatior : 



Fig. 16. Lower molar of the rigbt side, the second or third of tbo series, seen on tbo tritu- 

 rating surface, magnified three diameters. 



Fig. 17. U[)per molars of the same animal, ajipareutly the intorraediatc pair. Outer view, 

 magnified three diameters. 



Fig. 18. View of the triturating surfaces of the same teeth, maguified three diametens. 



Figs. 19, 20. MiCROSY'OPS (?) 



An upper molar tooth, magnified four times. 



Fig. 19. Outer view. 



Fig. 20. View of the triturating surface. 



Figs. 21, 22. Hyraciiyus nanus (?) 



A last upper premolar, magnified two diameters. 



Fig. 21. Outer view. 



Fig. 22. View of the triturating surface. 



