116 



MR. H. G F. SPURRELL ON THE 



[Feb. 6, 



bitten off for them by the incisors. This they are enabled to do 

 by the angle of the jaw, which places the articulation on a 

 different level from the teeth (text-fig. 38). The closure of the 



Text-fig. 37. 



Skull of Dog. 



A. Glenoid fossa decj)eiiecl by a process of the squamosal bono. 



B. Cylindrical condj'le of lowev jaw. 



Text-fiff. 38. 



Diagram of jaws. Type 2. 



mouth is efi'ected by the approximation of the points A and B 

 (which correspond mechanically to A and B in text-fig. 36, C being 

 Ihe fulci'um in both diagrams). 



When the jaws close on an object between them, the pressure 



