180 



Fig. 12. a, rii^lit upper canine (<■), inner side: b, ib. hinder side; from a breccia-cave. 

 Fig. 13. First upper premolar, outer side; from a breccia-cave. 

 Fig. 14. Second upper premolar, side view; from a breccia-cave. 



The foregoing figures are from Thylacoleo carnifex, nat. size. 

 Fig. 15. Second upper carnassial, Machairodus, inner side view, nat. size. 

 Fig. 10. Second upper carnassial, Machairodus, working-surface, nat. size. 

 Fig. 17. Right upper premolar, inner side view, nat. size, Hypsiprymnus. 

 Fig. 18. Right upper premolar, working-surface, nat. size, Hypsiprymnus. 



PLATE VIII. 



Fig. 1. Left mandibular ramus, wanting the " rising branch," outer side view ; ib. i, a sec- 

 tion of fractured laniary. 



Fig. 2. Left mandibular ramus, wanting the " rising branch," inner side view. 



Fig. 3. Left mandibular ramus, wanting the " rising branch," upper view, with working- 

 surface of carnassial. 



Fig. 4. Under view of beginning or fore part of the inflected angle. 



Fig. 5. Back view of fractured ditto. 



Fig. 6. Lower carnassial tooth (p 4), outer side, with fangs exposed. 



The foregoing figures are from Thylacoleo carnifex, nat. size. 

 Fig. 7. Lower carnassial, outer side, Machairodus, nat. size. 

 Fig. 8. Left lower premolar, outer side, Hypsiprymnus, nat. size. 

 Fig. 9. Left lower carnassial, inner side, Machairodus, nat. size. 

 Fig. 10. Left lower premolar, inner side, Hypsiprymnus, nat. size. 

 Fig. 11. Working-surface of lower carnassial, Thylacoleo, less worn than in fig. 3, nat. 

 size. 



Fig. 12. Working-surface of lower carnassial, Hyaena, nat. size. 

 Fig. 13. Working-surface of left lower premolar, Hypsiprymnus. 



The line I indicates the total length of the mandible of Thylacoleo when 

 entire. 



PLATE IX. 



Fig. 1. Horizontal ramus of right mandible, with teeth, outer side view, nat. size; from 

 a " photograph." (Original, a cave-specimen in the Museum of Natural His- 

 tory, Sydney, New South Wales.) 



Fig. 2. Fore part of mandibular ramus, showing depth of implantation of laniary (1), 

 and part of socket of carnassial (p 4) ; from a " photograph." (Id. ib.) 



Fig. 3. Front view of mandible and teeth; the bone in outline: from original fossils. 



Fig. 4. Right lower incisor, inner side view ; from a " photograph." (Original, a cave- 

 specimen in the Museum of Natural History, Sydney, New South Wales.) 



