INTRODUCTION. 



dog, Cants domesticus. 

 sification : 



Hence we have the following clas- 



DOG. 



Kingdom : of Animals. 

 Branch : Backboned, Vertebrates. 

 Class: Milk-givers, Mammalia. 

 Order : Flesh-eaters, Carnivora. 

 Family : Dogs, Canidae. 

 Genus : Dog, Canis. 

 Species : Canis domesticus. 

 Variety : Newfoundland. 



The present views of naturalists regarding the approxi- 

 mate relationships of the great branches may be repre- 

 sented by the following provisional table : 



IX. Vertebrata. 



VIII. Tunica fa. 



VII. Arthropoda. 



Crustaceans. Insects. 



I I 



VI. Mollusca. 

 Oysters, Cuttles, etc. 



V. Vermes. 

 Worms. 



IV. Echinodermata. 

 Starfish, Sea-cucumbers, etc. 



III. Caelenterata. 

 Corals, Jelly-fishes, etc. 



II. Ponfera. 

 Sponges. 



METAZOA. 



Many-celled Animals. 



I. PROTOZOA. 



Single-celled Animals. 



