12 NERVE COMPONENTS OF BONY FISHES. 



No new component is introduced; a pre-existing struc- 

 ture is simply enlarged. 



Again, one of the most conspicuous features of the 

 brain of certain types of fishes, such as the carp, is the 

 enormous lobi vagi. (Text-figure 2). These constitute 

 the terminal nuclei of the vagus nerves and correspond, 

 at least roughly, to the sensory vagus nuclei of man. 

 They are very small in fishes like the eel, whose gills are 



Text-Figure 3. 



Text-Figure 3. — The brain of Ammrus as seen from above. 

 After Kingsbury. Lod. fac. — the lobus facialis; ta. — the tuber- 

 culum acusticum ; other letters as before. 



reduced, but in the cyprinoid fishes are related not only to 

 the elaborate gill apparatus and the taste buds of the 

 mouth, but especially to the buds of the huge and 

 peculiar palatal organ and also to the widely scattered 



