Herrick, Nerviis Term'maJis of Frog. 



183 



om 



eruti 



n. term l-riaUs'' 



Fig. 3. Tlirougli the olfactory bnlbs at the level of the rostral ends of the 

 rhiiiocoeles. x 30. 



The stippled area surrounding each rhinocoele indicates the extent of the 

 layer of granule cells, most of which are not impregnated in the preparation. 

 A few impregnated granules are drawn on the right side. Several typical 

 neurones of the mitral cell layer are drawn on the left side. Fibers of the 

 tractus olfactorius pass dorsad from all parts of the mitral cell layer. The 

 glomerular layer lies farther ventrally, while the layer of fila olfactoria 

 occupies the extreme ventral part of each bulb. The nervus terminalis has 

 separated from the fila olfactoria on each side and lies between the latter 

 and the meninges. 



