PLATE IV. 

 Fig. 5 (x 1-28). 



The ethmo-turhinnls of n do,^, showing olf.-ictory nerves in the deeper 

 hvj-ers of the nnicosa and the branching of the nerves whicli lie upon each 

 other. The lining of the maxillary sinus is turned forward to show the 

 thinner part of the folds ; these are thick in the region supplied by the 

 olfactory nerves: the thin part is not olfactory. The anterior ethmoidal 

 nerve is shown entering the skull through the "ethmoidal foramen. 



Fig. 6 (X 1.8). 



Same animal as shown in Fig. 5.. Dorsal view of the ethmo-turbinals to 

 show the olfactory nerves. Note the anterior ethmoidal branch of the .5tQ 

 nerve to the septal mucosa. 



Fig. 7 (X 1-2). 



Median section of the head of a dog with the bony septum removed to 

 show the turbinal part of the septum and its olfactory nerves ; the septum 

 and its olfactory nerves, the anterior ethmoidal and the naso-palatine nerves. 



