284 
PROFESSOR OWEN ON THE FOSSIL MAMMALS OF AUSTRALIA. 
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. 
Fig. 6. Inside view of the same specimen. 
Fig. 7. Upper view of symphysis and incisor of the same specimen. 
Fig. 8. Working-surface of the molars of the same specimen. 
Fig. 9. Working-surface of the lower molars of a full-grown or mature individual of a 
large male of /Sthenurus Atlas (or of a larger species of Sthenurus). 
Fig. 10. Outside view of part of left maxilla and teeth of a mature individual of 
Macropus Titan. 
Fig. 11. Under view, with working-surface of molars, of the same specimen. 
Fig. 12. Inner side view of the same specimen. 
Fig. 13. Outside view of major part of the left mandibular ramus and teeth of a mature 
individual of Macropus Titan. 
Fig. 14. Working-surface of the molars of the same specimen. 
Fig. 15. Inside view of the same specimen. 
Fig. 16. Upper view of part of the symphysis and incisor of the same specimen. 
Fig. 17. Upper view of a small portion of the right mandibular ramus of a young 
Macropus Titan. 
Fig. 18. Outer side view of the same specimen, with the germ of the premolar ( p 3) ex- 
posed in its formative alveolus. (This is the type specimen of Macropus 
Titan figured in Mitchell’s ‘Three Expeditions,’ See., p. 359, pi. xxix. fig. 3.) 
PLATE XXIII. 
Fig. 1. Outer side view of right maxillary, with the molar teeth and their roots exposed, 
of a large old male Macropus rufus. 
Fig. 2. Outer side view of right maxillary and teeth of Macropus Titan. (From the spe- 
cimen No. 1519, ‘ Fossil Mammalia,’ in the Museum of the Royal College of 
Surgeons : Catalogue of Fossils, 4to, 1845, p. 324.) 
Fig. 3. Under view, with working-surface of the teeth, of the same specimen. 
Fig. 4. Outer side view of portion of right maxillary and teeth of a young Protemnodon 
Anak. 
Fig. 5. Working-surface of the teeth of the same specimen. 
Fig. 6. Inner side view of the same specimen, with the premolar ( p 3) exposed in its 
formative cavity. (From the specimen No. 1519, ‘Fossil Mammalia,’ in the 
Museum of the Royal College of Surgeons; wrongly ascribed to Macropus 
Atlas in my ‘ Catalogue,’ 4to, 1845, p. 327.) 
Fig. 7. Outer side view of portion of the left maxillary of a young Protemnodon Anak. 
Fig. 8. Working-surface of the teeth of the same specimen. 
Fig. 9. Inner side view of the same specimen, with the premolar (p 3) exposed in its 
formative cavity. (From the specimen No. 1513, ‘Fossil Mammalia,’ in the 
