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PROFESSOR OWEN ON THE FOSSIL MAMMALS OF AUSTRALIA. 
PLATE XXXIX. 
Fig. 1. Outside view of last upper molar (m 3) of a small, probably female, Diprotodon. 
Fig. 2. Outside view of last upper molar (m 3) of a larger, probably male, Diprotodon. 
Fig. 3. Sockets and ends of roots of penultimate and last upper molars. 
Fig. 4. Outside view of lower incisor [an extent of an inch is wanting at the place of 
fracture]. 
Fig. 5. Working surface of exposed end of lower incisor. 
Fig. 6. Transverse section at its emergence from the socket. 
Fig. 7. Side view of secoud upper incisor (7 2). 
Fig. 8. Working surface of the same tooth. 
PLATE XL. 
Molar teeth of the lower jaw. 
Fig. 1. Outer side view of second molar (d 4) of a young Diprotodon. 
Fig. 2. Working surface of second molar ( d 4) of a young Diprotodon. 
Fig. 3. Working surface of second molar of an older, probably female, Diprotodon. 
Fig. 4. Working surface of second molar of an old, probably male, Diprotodon. 
Fig. 5. Outer side view of third molar (m 1) of a young Diprotodon. 
Fig. 6. Working surface of third molar (m 1) of a young Diprotodon. 
Fig. 7. Working surface of third molar (m 1) of an older, probably female, Diprotodon. 
Fig. 8. Working surface of third molar (m 1) of an old, probably male, Diprotodon. 
Fig. 9. Outer side view of fourth molar (m 2) of a young Diprotodon. 
Fig. 10. Working surface of fourth molar (m2) of a young Diprotodon. 
Fig. 11. Working surface of fourth molar (m 2) of mature, probably male, Diprotodon. 
Fig. 12. Outer side view of crown of germ of fifth molar of a young Diprotodon. 
Fig. 13. Front view of fifth molar of a mature Diprotodon. 
Fig. 14. Working surface of penultimate lower molar of Macropus Atlas. 
Fig. 15. Working surface of penultimate lower molar of a Malayan Tapir. 
Fig. 16. Working surface of crown of incomplete fifth molar of a young Diprotodon. 
Fig. 17. Working surface of penultimate molar {m 2) of an old Diprotodon. 
Fig. 18. Working surface of last molar (m 3) of an old Diprotodon. 
Figures 1, 2, 5, 6, 9, 10, 12, 16 are from the same individual. 
All the figures are of the natural size. 
PLATE XLI. 
Fig. 1. Outside view of anterior part of mandible and teeth (7 1, d 4, m 1) of an immature 
Diprotodon : the first molar [d 3) is given in outline. 
Fig. 2. Inside view of anterior part of the same mandible and teeth (7 1, d 3 restored in 
outline, d 4, m 1). 
