PLATE VI. 



Figs. 26, 27. Paramys uelicatiok : 



Fig. 26. Left side lower jaw, with the second molar, natural size. Grizzly Buttes. Dr. 

 Carter. Fig. 27. Triturating surface of the second molar, magnified three diameters. 



Figs. 28, 29. Paramys delicatissimus : 



Fig. 28. Eight side of lower jaw, with all the molars, natural size. Grizzly Buttes Dr. 

 Carter. Fig. 29. Triturating surfaces of the molar series, magnified three diameters. 



Fig. 30. ScitjRAVUS(?) Triturating surface of a lower left third molar, magnified eight diameters. From 

 a portion of the lower jaw obtained at Grizzly Buttes hy Dr. Carter. 



Figs. 31,32. My'.sops minimus: 



Fig. 31. Right side of lower jaw, with third and fourth molars, magnified two diameters. 

 Fig. 32. Triturating surfaces of the teeth, magnified eight diameters. Dr. Carter. 



Figs. 33-35. LOPHIOTHERIUM SY'LVATICUM : 



Fig. 33. Portion of left side of lower jaw, with last premolar and first and last molars, 

 natural size. Fig. 34. Triturating surfaces of the last premolar and first molar. Fig. 35. 

 Triturating surface of the last molar. Specimen from Henry's Fork of Green River. 



Figs. 36, 37. NOTHARCTUS TENEBROSUS : 



Fig. 36. Eight side of lower jaw, with canine and all the molar series except the first pre- 

 molar, natural size. Fig. 37. The triturating surfaces of the molars, magnified two 

 • diameters. Specimen from Black's Fork of Green Elver. 



Figs. 38, 39. HipposTus roMosus (?) 



Fig. 38. Triturating surface of a lower right second molar, magnified two diameters. From 



a jaw-fragment from near Fort Bridger. Dr. Carter. 

 Fig. 39. Trituratiug surface of a left lower first molar, magnified two diameters. From a 

 jaw-fragment obtained by Dr. Carter near Fort Bridger. 



Fig. 40. HiPPOSYUS ROBUSTIOR : 



Triturating surface of a left lower second molar, magnified two diameters. From Henry's 

 Fork of Green Elver. Professor Haydeo. 



Fig. 41. HiPPOSYUS FORMOsus : 



Triturating surfaces of the upper left first and second molars, magnified three diameters 

 Specimen firom near Fort Bridger. Dr. Carter. 



Fig. 48. Hyrachyus nanus.: 



Triturating surfaces of the back two premolars, and the molars, magnified one and a half 

 diameters. Taken from the left side of the lower jaw of the same sjiecimeu represented 

 in Fig. 14, of Plate II. Specimen obtained by Dr. Corson at Grizzly Buttes. 



Fig. 43. Trogosus vetulus, probably Anchippodus : 



Eight lower incisor, natural size. From near Fort Bridger. Dr. Carter. 



Fig. 44. SiNOP.t^ RAPAX: 



Portion of left side of lower jaw, with last premolar and first molar, natural size. From 

 Grizzly Buttes. Dr. Carter. 



Fig. 45. SiNOPA ExiMiA : 



Portion of left side of the lower jaw, supposed to belong to a smaller species of the former 

 natural size. From Grizzly Buttes. Dr. Carter. 



Fig. 46. Pal^acodon verus : 



Penultimate molar of the upper left side, maguitied four diameters. From Lodge-polo trail. 

 Dr. Carter. 



