MAMMALS 



i?3 



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 

 B-2 Jaws not beaklike, young carried in pouch 

 A2 Perfect Mammals, young not hatched, nor 

 prematurely born 



r C 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 



Bi 



Digits 



■with 



claws 



B-, 



Digits 

 not 



distinct 



B 3 



Digits 

 with 



?nii/s 



or 



hoofa 



C 1 Head large ; carnivorous 

 C 2 Head small ; herbivorous 



'C 1 Five toes, nose prolonged into a snout 

 G> Toes odd number, less than five 

 C 3 Toes even number, upper front teeth 



lacking, chew the cud 

 C, Toes even number, upper front teeth 



present, not cud-chewers 

 C- All limbs having hands 

 C u Two limbs having hands 



Orders 



Mon'otremes 



Marsit'pials 



Ede?i fates 



Iiisect'ivors 



Car' nivors 

 Rodents 



Ceta'ceans 

 Sire'neans 



Proboscid' eans 

 Equities 



Ru'minants 





Swine 

 Quad rumans 

 Bi'mans 



3 



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) 



Rabbit (Fig. 345) 

 Dog (Figs. 356, 408) 

 Hog (Figs. 357, 393) 

 Bat (Figs. 347, 370) 

 Cat (Figs. 337, 348) 

 Armadillo 



(Figs 349, 365) 



Walrus (Fig. 340) 

 Monkey 



(Figs. 352, 401) 

 Horse 



(Figs. 355, 395) 

 Ant-eater 



(Figs- 354- 3 6 4) 



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. 



