X LIST OF ILLUSTRATIONS IN TEXT. 



FIG. PAGE 



71. Portion of tail-sheath of Hoplophorus, from the Pampa 



Formation of Buenos Aires ...... 76 



72. Skull and mandible of Diprotodon, austraUs, from the Pleisto- 



cene of Queensland ....... 78 



73. Skull and mandible of Thylacoleo ca/rnifex, from the Pleisto- 



cene of Australia ........ 79 



74. Lower jaw and teeth of Triconodon mordax, from the 



Purbeck Beds of Swanage ...... 80 



75. Part of lower jaw and teeth of Spalacotherium trimspidens, 



from the Purbeck Beds of Swanage . . . . * 80 



76. Lower jaw and teeth of Phascolotheriwm bucklandi, from 



the Stonesfield Slate of Oxfordshire .... 81 



77. Lower jaws of American Jurassic Mammals. (After Marsh) 



78. Upper molar tooth of Neoplagia/ulax eocenus, from the Lower 82 



Eocene of Bheims, Prance ...... 83 



79. Lower jaw and teeth of Plagiaulax becklesi, from the 



Purbeck Beds of Swanage ...... 83 



80. Jaws and teeth of Multituberculata, from the Jurassic of 



Wyoming, U.S.A. (After Marsh) 84 



81. Skull of Tritylodon longsevua, from the Karoo Formation of 



South Africa ........ 85 



82. Lower molar teeth of the existing Australian Monotreme, 



Omvithorhynchus. (After C. Stewart) .... 85 



83. Skull and mandible of Odontopteryx toUapica, from the 



London Clay of Sheppey ...... 87 



84. Skeleton of Hesperornis regalis, from the Cretaceous of 



Kansas, U.S.A. (After Marsh) .... 88 



85. Skeleton of Ichthyornis victor, from the Cretaceous of 



Kansas, U.S.A. (After Marsh) ... .89 



86. Eestored skull and mandible of Phororhachos longissimus, 



from the Santa Cruz Formation of Patagonia ... 90 



87. Diagrammatic sketch of the fossil Archseopteryx macrwra, 



from the Lithographic Stone of Bavaria ... 94 



88. Head of Archcuopteryx siemensi, from the Lithographic 



Stone of Bavaria. (After Dames) .... .95 



