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Description of the Plates. 

 PLATE XIX. 



Fig. 1. Side view of skull of Diprotodon australis : — one-fifth nat. size. 

 Fig. 2. Front view of skull of Diprotodon australis: — one-fifth nat. size. 

 Fig. 3. Back view of skull of Diprotodon australis: — one-fifth nat. size. 

 Fig. 4. Proportions of malar (26) and squamosal (27) forming glenoid cavity : — one-fifth 

 nat. size. 



Fig. 5. Side view of skull, in outline, of Macropus lanzger: — one-fifth nat. size. 



PLATE XX. 



Fig. 1. Outer side of first incisor, upper jaw: — nat. size. 

 Fig. 2. Inner side of first incisor, upper jaw: — nat. size. 



[An extent of an inch of the tooth is wanting at the place of fracture.] 

 Fig. 3. Outer or enamelled side of working extremity of a first incisor. 

 Fig. 4. Outer or enamelled side of working extremity of a first incisor from another 



individual. 



Fig. 5. Section, vertical and transverse, of premaxillary alveoli, with the first incisors, 

 i 1, in situ: i 2, end of the socket of the second incisor; i 3, part of that of 

 the third incisor. 



Fig. 6. Basal or inserted end of first incisor; the margin mutilated. 

 Fig. 7. Basal or inserted end of second incisor. 



All the figures are of the natural size. 



PLATE XXL 



Fig. 1. Outer side view of the right upper molars, in situ, of probably a female Diprotodon. 



Fig. 2. Grinding-surface of ditto. 



Fig. 3. The three last molars of another Diprotodon. 



Fig. 4. Grinding-surface of crown of last molar (m 3) of a larger, probably male, Dipro- 

 todon. 



Fig. 5. Front view of the same tooth. 

 Fig. 6. Back view of the same tooth. 



All the figures are of the natural size. . 



PLATE XXII. 



Fig. 1. Outer side view of the right upper molars, in situ, of a large, probably male, 

 Diprotodon. 



Fig. 2. Grinding-surface of ditto, with part of bony palate. 

 Fig. 3. Hind surface of last molar (m 3) of another Diprotodon. 

 Fig. 4. Front surface of the same tooth. 



All the figures are of the natural size. 

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