XIII 



PHYLUM CHORD ATA 



553 



large and prominent, the rest of the incisors and the canines beino- 

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



Fic. liss— Teeth of Great Kangaroo (.Vuf.o/ms m«jo/'). (After Owen.) 



Fir;. 11S9.— Fiont view of the skull of Tasmanian Devil (Sarcophilus itrsinvs), showing 

 polyprotodont and carnivorous dentition. (After Flower.) 



Fig. 1100. — Teetll of upper jaw of Opossum (Pidcl/'hys nmrmpiaHs), in all of whieh tliere 

 is no succession except in the last prc-njolar, ttic place of which is occupied in the young 

 animal by a molariforin tooth represented in tlie tigure below the line of the other teeth, 

 (After Flower and Lydckker. ) 



(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-molars and four molars. A good example 



