444 



MAMMALIAN ANATOMY 



FIG. 370. 



6 



p 



DIAGRAMS ILLUSTRATING THE EVOLUTION OF THE CROWNS OF THE 

 PREMOLAR AND MOLAR TEETH IN MAMMALS. 



The lower teeth are represented by heavy outlines, the upper teeth by light outlines ; the outer 

 side of each tooth is supposed to face toward the top of the page, and the anterior side to the left. 



