598 



DENTAL CHARACTERS OF AUSTRALIAN RATS. 



Text-fiarure 11. 



Left upper molar series of Notomys cervinus. A. Occlusal surface. 

 B. Alveolar cavities. 



Text-figure 12. 



Lower molar series of Notomys cervinus. A. Left upper molar crown-pattern. 

 R. Kight lower molar root cavities. 



Conclusion. — It is suggested that the study of the molar root- 

 pattern, and the expression of what might be termed a root- 

 formula, are of some importance in systematic work among the 

 Murines. Unfortunately it is not possible in Adelaide to carry 

 out even a partial survey of the Australian rodents, for the 

 material is not obtainable, but it is hoped that such workers as 

 possess material will record the root-patterns of Conilurus, 

 Mastacomys, and other interesting Austialian forms. 



