473 



PLATE LXXXI. 



Fig. 1 . Working-surface of right upper molars, Macropus major. 

 Fig. 2. Idem, Macropus rufus. 

 Fig. 3. Idem, Osphranter robustus. 



Fig. 4. Working-surface of right lower molars, Macropus rufus. 

 Fig. 5. Idem, Boriogale magnus. 



Fig. 6. Outer side view of left maxillary bone and molar series of a young Macropus 

 Titan. 



Fig. 7. Inner side view of left maxillary bone and molar series of a young Macropus 

 Titan. 



Fig. 8. Working-surface of molars of left maxillary bone of a young Macropus 

 Titan. 



Fig. 9. Back view of the same fossil, showing formative cell of the last molar, m 3. 

 Fig. 10. Palatal or under view of a left maxillary, with working-surface of the molar 



teeth of an older Macropus Titan. 

 Fig. 11. Working-surface of right upper molar series of a mature Macropus Titan. 

 Fig. 12. Working- surface of the last two lower molars, right side, Macropus Titan. 

 Fig. 13. Outer side view of the same teeth, with outline of part of mandible. 

 Fig. 14. Inner side view of the same teeth, with outline of part of mandible. 

 Fig. 15. Under or palatal view of right maxillary bone and teeth of an old Macropus 



Titan. 



Fig. 16. Outer side view of right maxillary bone and teeth of an old Macropus Titan. 

 Fig. 17. Inner side view of teeth of right maxillary bone of an old Macropus Titan. 

 Fig. 18. Hind surface of last upper molar (m 3) of Macropus Titan. 



PLATE LXXXII. 



Fig. 1. Outer side view of part of right maxillary and teeth of a young Phascolagus 

 alius ; the premolar [p 3) and penultimate molar (m 2) are exposed in their 

 formative alveoli. 



Fig. 2. Under view of the same specimen. 



Fig. 3. Upper view of portion of right mandibular ramus, showing the working-surface 

 of the molars in place, and of the crown of the last molar (m 3) in its forma- 

 tive alveolus, of a young Sthenurus Atlas. 



Fig. 4. Outer side view of part of the same specimen, with the crown of the premolar 

 exposed in its formative alveolus. (These figures are from the type-specimen of 

 Macropus Atlas, 0\v., figured in Mitchell's 'Three Expeditions,' &c, 8ve, 

 vol. ii. 1838, p. 359, pi. xxix. fig. 1.) 



Fig. 5. Outside view of a larger portion of the left mandibular ramus of an older indi- 

 vidual of Sthenurus Atlas ; the premolar (p 3) has not quite risen into place. 



