BRITISH ANIMALS. 



VERTEBRAL ANIMALS. 



WARM-BLOODED VERTEBRAL ANIMALS. 



The temperature of the body independent of the sur- 

 rounding medium. Ribs and sternum for the pro- 

 tection of the viscera. The Brain occupies the whole 

 cavity of the skull. Passage of the nose communi- 

 cates with the windpipe. Heart double, and the cir- 

 culation complete. 



f Young suckled by the mother. 

 Class I. MAMMALIA.-] Ovarium double. Covering of 



K. hair. 



C Young supported by food collected 

 by the mother. Ovai 

 Covering of feathers. 



II. COLD-BLOODED VERTEBRAL ANIMALS. 



Temperature of the body under the influence of the sur- 

 rounding: medium. Skin destitute of hair or feathers. 

 The brain does not occupy the whole cavity of the 

 skull. Circulating system imperfect. 



C Furnished with a systemic heart. In 

 Class I. REPTILES.-] general breathe air in their perfect 



(. state. 



Class II. BIRDS -j by the mother. Ovarium single. 



( Destitute of a systemic heart. Fur- 

 Class II. FISHES....-] nished with gills. Reside in wa- 



(. ter. 



A 2 



