74 



FOSSIL MAMMALIA OF THE 



cess ; the calcified summits indicate a conformable character with the antecedent molars. 

 In Macropus and most diphyodont Placentals the hidden and incomplete condition of the 

 last molar would imply, or be coincident with, a like condition of the last premolar. 



The coronoid process (fig. 7 a, e) is subrhomboidal, is broad, high, reclinate ; its 

 apex is continued backward to the same vertical line as that touched by the hind part of 

 the condyle which projects below the level of the alveolar outlets. The condyle {b) is 

 pedunculate at its upper part through the oblique deep notch between it and the coronoid. 

 It shows well the carnivorous mammalian convexity, tlie lower part of which is continued 

 into the lower border of the ascending raums. This border is inflected, and part of it is 

 retained in the grooved impression left on the slab (fig. 8 a, at a). The inflected border, 

 representing the ' angle of the jaw,' bounds the shallow longitudinal channel leading to 

 the entry of the dental canal. 



Fig. 5. 



Hind part of mandil)le of Thylaciuus (?, natuial size). 



The Thylacine (fig. 5), amongst known living zoophagous Marsupials, offers the nearest 

 approach to the indications of predatory nature given by the lower jaw and teeth of 

 Triacanthodon . But these indications are exaggerated in the concentrated carnivorous 

 character of those parts in the genus next to be described. 



