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CLASSIFICATION. 



ALL the individuals of any particular kind constitute a Species; 

 closely allied species are assigned to a common Genus; nearly- 

 related genera are considered as being of the same Family; 

 families having a general similarity in external appearance are treated 

 as belonging to the same Order; orders that are alike in some impor- 

 tant character are placed together in a Class; and, finally, the three 

 classes of animals possessing a Vertebra are grouped in one Sub- 

 Kingdom of the Animal Kingdom; the other sub-kingdom being com- 

 posed of the seven classes of Invertebrates: 



Protoza Cell organisms, such as- microbes, parasites, etc. 

 Co3lenterata Sea Anemones, Medusas, Coral, Sponges, etc. 

 Echinodermata Sea Urchins, Sea Eggs. 

 Vermes Worms. 



Molluscoidea Brachiopods, like snails, etc. 

 Mollusks Bivalves Oysters, Clams, etc. 



Anthropoda Insects, Spiders, Scorpions, and Crustaceans like 

 Crabs, etc. This is the most advanced class of the Inver- 

 tebrata, and the largest class in the Animal Kingdom, 

 including over 200,000 species. 



All fur-bearing animals belong to the class Mammalia, of the sub- 

 kingdom Vertebrata, which includes over 3,250 species, grouped under 

 1,000 genera, into 150 families, and eleven orders. The following 

 charts and tables show the proper grouping, and the relations and 

 affinities each to each, of the different species, which come within 

 the scope of this work. 



In the Classification Chart and Alphabetical List of Species the 

 accepted technical designation of the type species alone is generally 

 given, but in some cases the number of different varieties, or acknowl- 

 edged sub-species, of the animal is indicated by the figures in 

 parenthesis. The alphabetical list gives the technical designation of 

 each variety of the different species of the bear, so that the reader 

 may understand the apparent confusion of terms, where one writer 

 refers to the Grizzly as Ursus-horribilis, and another speaks of the 

 varieties of that animal found in Alaska and Mexico as Ursus- 

 alacensis and Ursus-horriaeus respectively. 



