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KEY, OR TABLE, FOR CLASSIFYING MAMMALS (class Mammalia) INTO ORDERS
| Orders | |||
| A1 Imperfect Mammals, young hatched or prematurely born | |||
| B1 Jaws a birdlike beak, egg-laying | Mon'otremes | ||
| B2 Jaws not beaklike, young carried in pouch | Marsu'pials | ||
| A2 Perfect Mammals, young not hatched, nor prematurely born | |||
| B1 Digits with claws | C1 Front part of both jaws lack teeth | Eden'tates | |
| C2 Teeth with sharp points for piercing shells of insects | Insect'ivors | ||
| C3 Canines very long, molars suited for tearing | Car'nivors | ||
| C4 Canines lacking, incisors very large | Rodents | ||
| B2 Digits not distinct | C1 Head large; carnivorous | Ceta'ceans | |
| C2 Head small; herbivorous | Sire'neans | ||
| B3 Digits with nails or hoofs | C1 Five toes, nose prolonged into a snout | Proboscid'eans | |
| C2 Toes odd number, less than five | E'quines | ||
| C3 Toes even number, upper front teeth lacking, chew the cud | Ru'minants | Ungulates | |
| C4 Toes even number, upper front teeth present, not cud-chewers | Swine | ||
| C5 All limbs having hands | Quad'rumans | ||
| C6 Two limbs having hands | Bi'mans | ||
Exercise in Classification.—Copy the following list, and by reference
to figures write the name of its order after each mammal:—
Ape (Figs. 405, 406)
Rabbit (Fig. 345)
Dog (Figs. 356, 408)
Hog (Figs. 357, 393)
Bat (Figs. 347, 370)
Cat (Figs. 337, 348)
Armadillo (Figs. 349, 365)
Cow (Figs. 344, 386)
Walrus (Fig. 340)
Monkey (Figs. 352, 401)
Horse (Figs. 355, 395)
Ant-eater (Figs. 354, 364)
Antelope (Fig. 391)
Mole (Figs. 367, 368)
Beaver (Figs. 372, 373)
Duckbill (Fig. 359)
Tapir (Fig. 384)
Dolphin (379, 397)
Use chart of skulls and Figs. 381, 382, 395-400 in working out this
exercise.
