XIII 



PHYLUM CHORDATA 



563 



large and prominent, the rest of the incisors and the canines being 

 smaller or absent. On the other hand, in the polyprotodont forms 



FIG. 1188. Teeth of Great Kangaroo (Man-opus mayor). (After Owen.) 



FIG. 1189. Front view of the skull of Tasmania!! Devil (Sarcophilus ursinus), showing 

 polyprotodont and carnivorous dentition. (After Flower.) 



FIG. 1190. -Teeth of upper jaw of Opossum (Diddphys marsupialis}, in all of which there 

 is no succession except in the last pre-molar, 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.) 



(Figs. 1189, 1190), which are all more or less carnivorous, the 

 incisors are numerous and sub-equal and the canines large. There 

 are typically three pre-niolars and four molars. A good example 



