KEY TO CLASSES AND ORDERS OF ANIMALS 51 



3(1, 2, 4) Feet with well-developed claws in land forms; canine 

 teeth specialized and prominent; molars fitted for 

 cutting; animals chiefly of carnivorous habit; cats, 

 dogs, seals, etc. (Cory, 273.) Order Carnivora 



4(1, 2, 3) Canine teeth absent; a wide gap between cheek teeth 

 and front teeth (incisors) which are large and chisel 

 shaped; never more than two incisors in the lower jaw. 



2 Q "2 "2 T 00 2 



Formtda varies between ^ and . Rabbits, 



1023 1002 



squirrels, etc. (Cory, 97.) Order Rodentia 



Section UNGULATA 



1(2) With two or four toes bearing hoofs; swine, deer, 

 cattle. (Cory, 58.) Order Artiodactyia 



2(1) In our species with only one hoof for each foot; horses. 



Order Perissodactylia 



