104 



BRAIN AND BODY OF FISH 



that the former are highly developed in order to give some functional 

 advantage to a predacious fish hunting in the depths which, in the 

 case of the deep sea lings, must be associated with almost complete 

 darkness. 



PLATE 21. 



Haddock 



Pollack 



Cod 



Ling*. 



Hake 



Dentition of the Gadoids figured in Plate XX to show relation of teeth to feeding- 

 habits. The drawings are of the upper jaw from below, u.j. — Upper jaw. 

 l.j. — Lower jaw. v.t. — Vomerine teeth. 



The drawing of the burbot (Plate 18, Fig./.) in column II is on 

 a bigger scale than the drawings of the two lings in the same column, 

 and the cerebellum has been removed at its base to expose the 

 medulla-oblongata. This fish is the only gadoid that has a fresh- 

 Avater habitat. The burbot or eel-pout has, as its name suggests, 

 some of the characteristics of an eel, as well as those of a cod. It is 



