696 The Tertiary Marsupialia. [July, 
The Pulodus medievus further differs from the Veoplagiaulas 
eocenus in the more rodent-like character of its incisor teeth. In 
the latter species these teeth resemble more those of the kanga- 
roos in their anterior direction. The diastema is longer in Ptil- 
odus, thus increasing the rodent resemblance. The fourth pre- 
molar is strongly serrate in the Neoplagiaulax, resembling in this 
also the Mesozoic types. 
The discussion between Professor Owen on the one side, and 
1e 
Thylacoleo Jaa i Owen; skull from below, one-half nat. es 
tha’ Pliog aan heds of Aus From restoration by Professor Owen in 
Magazine, 1883, p. 289. 
Messrs. Falconer, Krefft and Flower on the other, 
of the food of Thylacoleo, is known to paleontologists. 
the form of the teeth alone, Professor Owen inferred the mee 
Orous nature of the food of this genus, while his oppone. et gfe 
ferred a herbivorous diet from the resemblance betwee? 
tition and that of the herbivorous Hypsiprymnus. I have poi 
out (7. c.) that the comparison of Thylacoleo with HypsiP 
