PLATE XXVII. 



Fig. 23. Fragment of tbo left side of the lower jaw, coutainiug two premolars, apparently the third and 

 fourth, of au undetermined carnivore, natural size. From the Bridger Eocene of Wyo- 

 ming. 



Figs. 24, 25. Megalomeryx niobrarensisC?) A lower molar tooth, natural size. From the Tertiary of 

 L'Eau qui Court County, Nebraska. Sjiecimeu in the museuin of Swarthmore College. 



Fig. 24. Triturating surface. 

 Fig. 25. Outer view. 



Figs. 26-29. PROCA.MELUS viRGiNiENSis. Natural size. Specimens from the Miocene of Virginia, and 

 belonging to Mr. C. M. Smith, of Richmond, Virginia. 

 Fig. 26. Outer view of the last lower molar of the right side. 

 Fig. 27. Triturating surface of the same. 



Fig. 28. The last premolar and first molar of the right side, outer view. 

 Fig. 29. Triturating surfaces of the same. 



Figs. 30-34. Uesitatherium robostcm : 



Fig. 30. Last upper molar of the right side, (juter view, natural size. 



Fig. 31. Last lower molar of the right side, outer view, natural size. 



Fig. 32. Portiou of the left ramus of the lower jaw, one-half the natural size. . Fig. 33. Mu- 

 tilated corouoid and condyle of the same specimen as the former. 



Fig. 34. Upper view of the atlas, from the same specimen as Fig. 2, Plate XXVI, one-fourth 

 the diameter of nature. 



Fig. 35. Saniwa ensidens. Tooth magnified eight diameters. 



Figs. 36,37. Saniwa major: 



Two dorsal vertebra?, natural size. 

 Fig. 36. Inferior view. 

 Fig. 37. View of right side. 



Figs. 38, 39. Chameleo pristin0S. Fragment of the lower jaw, magnified three diameters. 



Fig. 36. Outer view. 



Fig. 39. Inner view. 



Fig. 40. Undetermined tooth of a reptile, magnified two diameters. From the Bridger 

 Eocene formation of Wyoming. It may be the tooth of a crocodile or a lacertian. It is 

 an isolated specimen, partially imbedded in a greenish sandstone, with fresh-water shells. 

 The crown is compressed mammillary, and strongly striate, from an acute-bordered summit. 



