ORIENTATION 



in all of these localities and the Platypus or Ornithorynchus paradoxus, is 

 an inhabitant of Australia. The urogenital ducts and intestine open posteriorly 

 into a common chamber, the cloaca. 



Division 2: Theria or true mammals 



The Theria bring forth their young alive, possess true mammary glands with 

 nipples, and all produce a small egg with little stored food material. They also 

 possess separate openings to the exterior for the urogenital ducts and the in- 

 testine, a cloaca being absent in the adult condition. 



Series 1 : Metatheria. These are the marsupial or pouched mammals such 

 as the Virginia opossum, Didelphys virginiana. 



Series 2: Eutheria. The following orders are given: 

 Subseries 1. Unguiculata or mammals with claws 

 Order 1. Insectivora or insect-eating mammals 



Examples: Moles and shrews 

 Order 2. Chiroptera or flying mammals 



Example: The bats 

 Order 3. Carnivora or flesh-eating mammals 



Examples: Wolves, dogs, foxes, raccoons, otters, skunks, weasels, 

 mink, hyenas, cats, lions, tigers 

 Order 4: Rodentia or gnawing mammals 



Examples: Rats, mice, rabbits, hares, guinea pigs, squirrels, bea- 

 vers, gophers (ground squirrels), prairie dogs 

 Order 5. Edentata or mammals without teeth or with reduced con- 

 dition of the teeth 

 Examples: Armadillos, three-toed sloths, anteaters 

 Order 6. Pinnipedia or mammals with bilateral appendages adapted 

 for swimming 

 Examples: Seals, sea-lions, walruses 

 Subseries 2. Ungulata or mammals with hoofs 

 Order 7. Artiodactyla or even-toed mammals 



Examples: Hippopotami, peccaries, swine, deer, moose, elk, 

 pronghorn antelope, cows, sheep, goats, camels, giraffe, 

 llamas, antelopes, gazelles 

 Order 8. Perissodactyla or odd-toed mammals 



Examples: Horses, zebras, asses, tapirs, rhinoceroses 

 Order 9. Sirenia or mammals with hind limbs absent and adapted 

 to living in the water 

 Example: The manatees or sea cows 

 Order 10. Proboscidea 

 Examples: The elephants 



