Suborder 1. POLYPROTODONTIA—Polyprotodonts. Fam. 1. =Dromatheriidæ=—Dromatherium. 2. =Amphitheriidæ=—Amphitherium, etc. 3. =Spalacotheriidæ=—Spalacotherium. 4. =Tritylodontidæ=—Tritylodon. 5. _Didelphyidæ_—Opossums. 6. _Dasyuridæ_—Thylacine and Dasyures. 7. _Peramelidæ_—Bandicoots. Suborder 2. DIPROTODONTIA—Diprotodonts. Fam. 8. _Phascolomyidæ_—Wombats. 9. _Phalangeridæ_—Phalangers. 10. =Diprotodontidæ=—Diprotodon. 11. =Nototheriidæ=—Notothere. 12. _Macropodidæ_—Kangaroos. Subclass III. EUTHERIA. Order iii. EDENTATA—Edentates. Fam. 1. _Bradypodidæ_—Sloths. 2. =Megatheriidæ=—Ground Sloths. 3. _Myrmecophagidæ_—Anteaters. 4. _Dasypodidæ_—Armadillos. 5. =Glyptodontidæ=—Glyptodonts. 6. _Manidæ_—Pangolins. 7. _Orycteropodidæ_—Aard-varks. Order iv. SIRENIA—Sirenians. Fam. 1. _Manatidæ_—Manatees. 2. =Rhytinidæ=—Rhytina. 3. _Halicoridæ_—Dugongs. 4. =Halitheriidæ=—Halithere. Order v. CETACEA—Cetaceans. Suborder 1. MYSTACOCETI—Baleen Whales. Fam. 1. _Balænidæ_—Greenland Whale, etc. Suborder 2. =ARCHÆOCETI.= Fam. 2. =Zeuglodontidæ=—Zeuglodonts. Suborder 3. ODONTOCETI—Toothed Whales. Fam. 3. _Physeteridæ_—Sperm Whale. 4. _Platanistidæ_—Freshwater Dolphins. 5. _Delphinidæ_—Dolphins, Porpoises, etc. Order vi. UNGULATA—Hoofed Mammals. Suborder 1. ARTIODACTYLA—Artiodactyles. Section A. SUINA—Pig-like Artiodactyles. Fam 1. _Hippopotamidæ_—Hippopotamus. 2. _Suidæ_—Pigs and Peccaries. Annectant types. { 3. =Chœropotamidæ=—Chœropotamus. { 4. =Anthracotheriidæ=—Anthracothere. { 5. =Merycopotamidæ=—Merycopotamus. { 6. =Cotylopidæ=—Oreodonts. { 7. =Anoplotheriidæ=—Anoplothere. { 8. =Dichodontidæ=—Dichodon. Section B. TRAGULINA—Chevrotains. 9. _Tragulidæ_—Chevrotains. Section C. TYLOPODA—Camels. 10. _Camelidæ_—Camels and Llamas. 11. =Poebrotheriidæ=—Poëbrotherium. Section D. PECORA—True Ruminants. 12. _Cervidæ_—Deer. 13. _Giraffidæ_—Giraffe. 14. _Antilocapridæ_—Prong-buck. 15. _Bovidæ_—Sheep, Cattle, etc. Suborder 2. PERISSODACTYLA—Perissodactyles.