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PROCESSOR OWEN ON THE EOSSIL MAMMALS OE AUSTRALIA. 
Description op the Plates. 
PLATE XX. 
Fig. 1. Side view of the cranium and teeth of a nearly full-grown Uroo (. Macropus 
( Phascolagus ) erubescens ). 
Fig. 2. Working-surface of the molars, left side, upper jaw, of a nearly full-grown Uroo. 
Fig. 3. Inner surface of the molars, left side, upper jaw, of a nearly full-grown Uroo. 
Fig. 4. Outer side view of mandible and teeth of the same skull. 
Fig. 5. Working-surface of the lower deciduous molars of the same skull. 
Fig. 6. Side view of molar series, left side, upper jaw, of a younger Phascolagus 
erubescens. 
Fig. 7. Working-surface of the molars in place of a younger Phascolagus erubescens. 
Fig. 8. Side view of portion of mandible, with the molar series, of the same skull ; the 
germ of the premolar is exposed in its formative cell. 
Fig. 9. Side view of molar series, left side, upper jaw, of a young Eed-necked Kan- 
garoo, Macropus ( Halmaturus ) rujicollis. 
Fig. 10. Side view of molar series, left side, lower jaw, of the same skull. 
Fig. 11. Side view of the left mandibular ramus and teeth of the yellow-foot Kangaroo, 
Macropus ( Petrogale ) xanthopus. 
Fig. 12. Working-surface of upper molars, right side, of Macropus [Boriogale) magnus. 
Fig. 12 a. Side view of three anterior lower molars of Boriogale magnus . 
Fig. 13. Side view of the left mandibular ramus and teeth of Macropus ( Osphranter ) 
robustus. 
Fig. 14. Working-surface of the molar series of ditto. 14'. [a, side view of upper pre- 
molar ; b, working-surface of ditto. 
Fig. 15. Side view of the left mandibular ramus and teeth of the Giant Kangaroo, 
Macropus major. 
Fig. 16. Working-surface of the molar series of the Great Kangaroo. 
Fig. 17. Side view of the left upper incisors, Macropus major. 
Fig. 18. Idem, Osphranter robustus. 
Fig. 19. Idem, Boriogale magnus. 
Fig. 20. Idem, Halmaturus ualabatus. 
Fig. 21. Idem, Halmaturus rujicollis. 
Fig. 22. Idem, Petrogale xanthopus. 
Fig. 23. Working-surface of left upper molar ( m 2 ), Macropus major. 
Fig. 24. Idem, Macropus rufus. 
Fig. 25. Idem, Osphranter antilopinus. 
Fig. 26. Working-surface of left lower molar (m 2 ), Boriogale magnus. 
Fig. 27. Working-surface of left upper molar (m 2 ), Halmaturus ualabatus. 
Fig. 28. Idem, Petrogale xanthopus. 
