390 



Fig. 2. Alveolar border and fractured crowns of the second and third molar 

 teeth, m 2, m 3 : s, the margin of the symphysis ; i, the tusk ; ml, socket 

 of the first molar. 



Fig. 3. Inside view; showing the form and extent of the symphysis, s, s. 



Fig. 4. Lower border of the same fragment : *, the tusk. 



Fig. 5. Lower border of the posterior part of the ramus of the jaw of the 

 same species of Diprotodon (see No. 1461.); showing the inflected 

 angle at a. 



Fig. 6. Outline of the transverse section of the incisive tusk of the Dipro- 

 todon australis, showing the partial coating or enamel at e, e. 



PLATE VIII. 



Views of the right ramus of the lower jaw of the Nototherium inerme (see No. 

 1505.): half the natural size*. 



Fig. 1 . Outside view ; with ideal outlines of the crowns of the four molar 

 teeth. 



Fig. 2. Alveolar border. 



Fig. 3. Inside view, showing the short symphysis and the rounded and in- 

 flected angle of the jaw. 



Fig. 4. The fractured surface of the anchylosed symphysis, showing the com- 

 pact osseous texture, and the absence of any socket for an incisive tusk. 



Fig. 5. Outline of the crown of the last molar, natural size, showing the 

 thickness of the enamel and the divisions of the pulp-cavity which di- 

 vides and descends into the fangs. 



PLATE IX. 



Views of the posterior part of the left ramus of the lower jaw of the Noto- 

 therium Mitchelli (see No. 1506.) ; half the natural size. 



Fig. 1. Outside view, with restored outlines of the penultimate and last molar 

 teeth. 



* The specimen has been intentionally drawn unreversed upon the stone, in order that the figure 

 might print off as the left ramus, and so correspond and facilitate the comparison with Plate IX. 



