INTRODUCTION. 3 
dog, Canis domesticus. Wence we have the following clas- 
sification : 
DOG. 
Kingdom: of Animals, 
Branch: Backboned, Vertebrates. 
Class: Milk-givers, Mammalia. 
Order : Flesh-eaters, Carnivora. 
Family : Dogs, Canide. 
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 provistonal table : 
IX. Vertebrata. 
VIII. Tunicata. 
VII. Arthropoda. 
Crustaceans. Insects. 
VI. Mollusca. 
Oysters, Cuttles, etc. 
V. Vermes. 
Worms. 
i 
IV. Echinodermata. | 
Starfish, Sea-cucumbers, etc. 1 
Ill. Celenterata. 
Corals, es (ins etc. Il. Porifera. 
Span est 
| 
| 
METAZOA. 
Many-celled Animals, 
I. PROTOZOA. 
Single-celled Animals, 
