182 On a Cuvierian Principle in Palmontology. 



the fellest of savage carnivores ? How bears " the Cuvierian 

 principle " an ordeal with animals which Cuvier did not know 

 and did not dream of? The test has been applied, and human 

 vanity is exposed again. 

 Sydney, May 15th, 1872. 



EXPLANATION OF THE PLATES. 

 Plate XI. 



Fig. 1, Lower jaw of Thylacoleo, showing the position of the broken 

 ramus and coronoid process, restored from fragments in the Aus- 

 tralian Museum at Sydney : a, incisors ; h, two or three tuber- 

 cular teeth, representing canine and ^ first and second premolars ; 

 c, third premolar ; d, first molar ; e, second molar ; f, base of 

 fractured ascending ramus and coronoid process. 



Fiff, 2. Skull of Thylacoleo from the side, restored : a, first, i, second, c, 

 third upper incisor ; d, upper canine ; e, first, /, second, </, third 

 upper premolar; 7j, lower incisor; i, two or three tubercular 

 teeth representing canine and premolars ; ./, third lower pre- 

 molar ; k, first, I, second lower molar ; m, inflected angle of lower 

 jaw; n, condyle. 



Fig. 3. Skull of Thylacoleo as restored by Krefft in 1869. 



Fig. 4. Skull of Thylacoleo as restored by Prof. Owen in the Encycl. 

 Brit. vol. xvii. p. 175 (1859). 



Fig. 5. Lower jaw of Cuscus viaculatus, showing close relationship to 

 Thylacoleo. 



Figs. 6, 7. The skull and lower jaw of Dactylopsila trivirgntay to show 

 the powerful incisor teeth of a vegetable- or mixed-feeding pha- 

 langer. 



Fig. 8. Canine and upper front teeth of Bettongia rufescens : a, first in- 

 cisor; b, canine. 



%* All, except fig. 8, reduced about one half. 



Plate XII. 



Fig. 1. The dentition of Thylacoleo, reduced about one half. The letters 



as in PI. XL fig. 2. 

 Fig. 2. Left lower incisor, showing the extent of the enamelled portion. 

 Fig. 3. Right lower incisor, outer surface. 

 Fig. 4. First right upper incisor : a, inner, and b, outer view, showing the 



extent of the enamelled part. 

 Fig. 5. First left upper incisor, inner view. 

 Fig. 6. First right upper incisor, two views, from Sir T. Mitchell's ' Three 



Expeditions,' 1836. 

 Fig. 7. Right lower incisor, with fractured crown, from Sir T. Mitchell, 



1836. 

 Fig. 8. Left lower incisor of a young Thylacoleo. 

 Figs. 9, 10. Second upper incisors. 



Fig. 11. Right upper canine of a new species of Thylacoleo. 

 Fig. 12. Fractured upper canine. 

 Figs. 13, 14. Upper canines. 

 Figs. 15-18. Four premolars. 

 Fig. 19. Right lower third premolar, much worn, from Sir T. Mitchell, 



1836. 

 Fig. 20. Upper molar, right side. 

 Fig. 21. Upper canine of a tiger. 



