107 



the light thrown by Palaeontology upon ancient geography. The inference, at least, is 

 legitimate that, with the' northern extension of geographical range of the genera TJtylacinm 

 and Sarcophilus, there coexisted a corresponding continuation of dry land, uniting the 

 now distinct island of Tasmania with the Australian continent. The ancient representation 

 of these genera by larger and more formidable species agrees with the co-existence, to be 

 demonstrated in the course of the present work, of larger herbivorous Marsupials than 

 now exist in either Australia or Tasmania. 



PLATE V. 



Fig. 1. Palatal surface of fore part of the skull of Dasyurus laniarius. 

 Fig. 2. Outer side view of the premaxillary and part of the maxillary of do: 2'. Trans- 

 verse section of the canine. 

 Fig. 3. Outer side view of part of the maxillary of do. 

 Fig. 4. Outer side view of mandible and teeth of do. 

 Fig. 5. Inner surface of symphysis mandibuke and teeth of do. 

 Fig. 6. Outer surface of the same fossil. 



Fig. 7. Crown of upper canine of Thylacinus major ■. 7'. Transverse section of do. 

 Fig. 8. Outer side view of hind part of mandible and teeth of Tht/lacinus major. 

 Fig. 9. Outer side view of fore part of mandible and teeth of Thylacinus major. 

 Fig. 10. Inner side view of part of the mandible and teeth of Dasyurus mortlax. 

 Fig. 1 1 . Outer side view of part of mandible and teeth of Peramcles tenuirostris. 

 Fig. ]2. Outer side view of fore part of mandible of Phalanyista sicca. 

 Fig. 13. Portion of right maxilla and teeth of Hypsiprymnus spelaus. 

 Fig. 14. Outer side view of mandible and teeth of Hypsiprymnus spe/'aus. 

 Fig. 15. Outer side view of mandible and teeth of Bettonyia cuneafa. 



Suborder DIPROTODONTI A. 



Section SARCOPHAGA. 

 Genus Thylacoleo, Ow. 



Species Thylacoleo carnifcx, Ow. 



The first indication of this genus and species was the large, two-fanged sectorial 

 tooth, the subject of figs. 10 and 11, plate 32 of Mitchell's work above cited. I 

 could not, at that date, determine the affinities of the Australian mammal yielding such 

 a tooth ; and for some years it was open to any palaeontologist to offer an interpretation 



