xii LIST OF ILLUSTRATIONS. 



Figs, i, 4, 22, 28, 32, 48, 49, 50, 52, 53, 54, 55, 57, 59, 60, 63, 65, 66, 68, 

 70, 71 are from The Study of Mammals > Living and Extinct, by Flower and 

 Lydekker. Figs. 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24 are taken from the 

 author's work on Argentine Fossil Mammals, published in the An. Mus. La 

 Plata. Figs. 9, 25, 26, 27 are from Senor Ameghino. Fig. 67 is from a photo- 

 graph by Mr Abel Chapman. Fig. 82 is from Prof. Cope, fig. 81 from Prof. 

 Earle, fig. 40 from Prof. Boyd Dawkins, fig. 30 from Prof. Fraas, and figs. 7, 8 

 from Prof. Goodyear. Fig. 46 is taken from a plate in Hutchinson's Extinct 

 Monsters ; 58 from a photograph by Mr Eccles, of Reading, and 75 from one 

 in the possession of Mr J. E. Harting. Figs. 6, 35, 41, 43 are from Prof. 

 Marsh; and n, 12, 31, 33, 37, 78, 79, 80 from Prof. H. F. Osborn. For the 

 blocks of figs. 72, 73, 74, the author is indebted to Dr C. H. Merriam. 

 Fig. 45 is from Nicholson and Lydekker's Manual of Paleontology ; fig. 29 

 from Owen; fig. 64 from Dr Sclater in the Proc. Zool. Soc.; fig. 77 from Dr 

 Wortman, and 39 from Prof, von Zittel. 



