OUTLINES OF GEOLOGY. 



23 



46. Fossils are important distinctive characters, by which 

 to determine the identity or analogy of formations ; hence 

 some knowledge of the organic world is essential in geology. 



Organized beings are divided into two great kingdoms, 

 the animal and vegetable. These are again ranked in grand 

 divisions, classes, orders, families, genera, and species. 



The animal kingdom has four grand divisions, viz. : 



1. Vertebratse; 



2. Articulatse; 



3. Moluscae; 



4. Radiatse; 



47. The following is the arrangement of vertebrated ani- 

 mals ; — 



Class. Order. Family. Instances of Genera. 



" Bimana, Man. 

 Quadrumana, Monkey. 



C Plantigrade, Bear. 

 Carnaria, 1 Digitigrade, Dog. 



£ Amphibia, Seal. 

 Marsupia, Opossum. 

 Rodentia, Rat. 



C Tardigrade, Sloth* 

 Edentata, ^ Ordinaria, Ant Bear. 



( Monotreme, Ornithoryncus. 



Mammalia. \ 



Pachyder- 



MATA. 



Proboscidia, Elephant. 

 Ordinaria, Hog. 

 Solipes, Horse. 

 I Camel, 

 Lama, 



Chevrotain, Musk. 

 Giraffe, 

 Ruminantia \ Deer, j 



Antelopes, 

 Goats, 

 Sheep, 

 ^Bos, 

 Herbivorous 

 Ordinaria. Whale. 



Cetacea, 



