BRITISH ANIMALS. 



VEKTEBRAL ANIMALS. 



(I. WARM-BLOODED VERTEBRAL ANIMALS. 



The temperature of the body independent of the sur- 

 I'ounding 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. 



C Young suckled by the mother. 

 Class I. MAMMALIA. -< Ovarium double. Coveruig of 



i. hair. 



r Young supported by food collected 



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



Coveringf of feathers. 





fix. 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, s general breathe air in their perfect 

 V state. 



( Destitute of a systemic heart. Fur- 

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

 (. ter. 



A'il 



