XIII 



PHYLUM CHORDATA 





Pleistocene Marsupials are for the most part referable to existing' 

 families and even genera, representing both the Diprotodont and 

 the Polyprotodont sections ; but some differ widely from existing 

 forms. One of these, Diprotodon (Fig. 1160), was the largest 



FIG. 1101. Nototherium mitchelli. Side view of skull. (After Owen.) 



known Marsupial, having reached the dimensions of a Rhinoceros ; 

 it occupies a position intermediate between the Phalangers 

 and the Kangaroos. Nototheriuin (Fig. 1161), also of large 



FIG. 11(32. Thylacoleo carnife Side view of skull. (After Flower.) 



size, seems to connect together the Diprotodon, the Wombats, 

 and the Phalangers. Thylacoleo (Fig. 1162) is an extinct genus 

 referable to the Phalanger family, and characterised by an 



