INTRODUCTOllY. 4^']0 



Ji;J, (fig. 2 — 3,) that is, live on each side of the canine teeth of 

 each jaw, making in man a total of thirty-two teeth. Tlie 

 Chimpanse, an animal which stands next to man, as approach, 

 ing nearest to him in his organization, has a similar arrange, 

 nient in the number and Itinds of his teeth. 



The class Mammalia is divided in the following orders by 

 Cuvier and Latreille : — 



I. BiMANA ; with two hands, of which man is the only spe- 

 cies. He possesses three kinds of teeth. 



II. QuADRUMANA ; or animals with four hands, and having 

 three kinds of teeth. 



III. Cheiroptera. The general form of these animals is 

 adapted for flight ; with a fold of skin between their four limbs, 

 and two pectoral teats, and they have three kinds of teeth. 



IV. Fer^. The four extremities are formed for walking 

 with three kinds of teeth : the teats vary in number. 



V- Marsupialia. These vary in different genera. The 

 young are produced prematurely, and brought to perfection in an 

 abdominal pouch which incloses the teats. 



VI. RoDENTiA. These have two large incisory teeth in each 

 jaw, separated from the grinders by a vacant space ; they have 

 no canine teeth : the grinders have flat crowns, or, if tubercu 

 lated, they are blunt ; the bind limbs are longer than the fore 

 ones, and furnished with nailed toes, and varying in different 

 species : the teats are also variable. 



VII. Edentata. The animals of this order have no inci- 

 sory teeth in either jaw ; some species have canine teeth and 

 grinders, and others grinders only. Some genera are destitute 

 of teeth : they have feet, with toes variable in number, which 

 are armed with strong nails. 



VIII. Pachydermata. These have either three, or two 

 kinds of teeth ; the toes are variable in number, and furnished 

 with strong nails or hoofs : the organs of digestion are formed 

 for ruminating. 



IX. Ruminantta. The genera of this order have no incisory 

 teeth in the upper jaw, and are usually furnished with eight in 

 the lower one : there is a vacant space between the incisory 

 teeth and the grinders. Some genera have one or two canine ; 

 teeth : the grinders are twelve in each jaw ; they have two toes 

 protected by hoofs j they have four stomachs ; the males have 

 always horns, as also the females in some species. 



