MAMMALS 



193 



KEY, OR TABLE, FOR CLASSIFYING MAMMALS 

 (class Mammalia) INTO ORDERS 



AI Imperfect Mammals, young hatched or pre- 

 maturely born 



BI Jaws, a birdlike beak, egg-laying 

 BS Jaws not beaklike, young carried in pouch 

 A2 Perfect Mammals, young not hatched, nor 

 prematurely born 



Front part of both jaws lack teeth 

 C 2 Teeth with sharp points for piercing 



shells of insects 

 C 3 Canines very long, molars suited for 



tearing 

 C 4 Canines lacking, incisors very large 



B 2 f 



Digits I C 1 Head large ; carnivorous 

 not I C 2 Head small ; herbivorous 

 distinct 



Bi 



Digits 



with 



claws 



Digits 

 with 

 nails 

 or 

 hoofs 



C 1 Five toes, nose prolonged into a snout 



C Toes odd number, less than five 



C 3 Toes even number, upper front teeth 



lacking, chew the cud 

 C 4 Toes even number, upper front teeth 



present, not cud-chewers 

 C 5 All limbs having hands 

 C 6 Two limbs having hands 



ORDERS 



Mon'otremes 

 Marsu'pials 



Edentates 

 Insect' ivors 



Car'nivors 

 Rodents 



Cetaceans 

 Sire'neans 



Proboscideans 

 Equities 



Ru'minants 



Swine 



Quad'rumans 

 Bi'mans 



Exercise in Classification. Copy the following list, and by refer- 

 ence to figures write the name of its order after each mammal : 

 Ape (Figs. 405, 406) Cow (Figs. 344, 386) Antelope (Fig. 391) 

 Walrus (Fig. 340) 

 Monkey 



(Figs. 352,401) 

 Horse 



(Figs. 355, 395) 

 Ant-eater 



(Figs. 354, 364) 



Rabbit (Fig. 345) 

 Dog (Figs. 356, 408) 

 Hog (Figs. 357,393) 

 Bat (Figs. 347, 370) 

 Cat (Figs. 337, 348) 

 Armadillo 



(Figs. 349, 365) 



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. 



o 



