XIII 



PHYLUM CHORDATA 



531 



are all more or less carnivorous, the incisors are numerous and sub- 

 equal and the canines large. There are typically three pre-molars 



FIG. 1119. Teeth of Great Kangaroo (Macropus major)] '(After Owen.) 



FIG. 1120. Front view of the skull of Tasmanian Devil (SarcopJiilus iirsinv.s), showing 

 polyprotodont and carnivorous dentition. (After Flower.) 



FIG. 1121. Teeth of upper jaw of Opossum (Didelphys marsupialis), all of which are 

 unchanged except the last premolar, the place of which is occupied in the young animal by 

 a molariform tooth represented in the figure below the line of the other teeth. (After Flower 

 and Lydekker.) 



and four molars. A good example of the diprotodont arrangement is 

 the Kangaroo (Macropus) (Fig. 11 19), which has the dental formula 



.3 



4 

 ' 4 



M M 2 



