Molar Teeth of the Chinchilla--The Chinchilla 139 Molar Teeth of the Agouti--Azara’s Agouti 140 Skull of the Paca--The Paca 141 The Dinomys 142 The Patagonian Cavy 144 Molars of the Capybara 145 The Capybara 146 The Common Hare 148 The Alpine Pika 150 Side View of Skull and Lower Jaw of Mesotherium Cristatum--Dentition of Mesotherium Cristatum 155 Group of Sloths 158 Skeleton of the Sloth 161 Bones of Hand of Three-toed Sloth 162 Skull of Sloth 163 The Collared Sloth 164 The Ai 165 Skull of Ai 166 Stomach of Sloth 167 Hoffmann’s Sloth 168 The Cape Ant-eater 170 Skull of the Cape Ant-eater 171 Temminck’s Pangolin 172 The Four-fingered Pangolin 173 The Five-fingered Pangolin 175 The Great Ant-Bear 177 The Two-toed Ant-eater 180 Bones of Claw of Great Armadillo 181 Skeleton of the Armadillo--Skull of the Armadillo 182 The Great Armadillo--Brain of the Armadillo 183 The Poyou 185 The Ball Armadillo 188 The Pichiciago 189 The Great Kangaroo _To face page_ 191 Skeleton of the Great Kangaroo 192 Teeth of the Great Kangaroo 193 Stomach of the Great Kangaroo 195 Brain of the Great Kangaroo 196 The Brush-tailed Rock Kangaroo 197 The Common Tree Kangaroo 198