ANATOMY OF THE GUNNER. 



441 



superior (Os) and inferior (Oi), arise from the front of the 

 orbit near the interorbital septum. The disposition of the 



B 



A 



Fig. 400. Anatomy of the brain of the Gunner, dorsal and side view. J}, Ol, olfac- 

 tory lobes ; the crura and the thalami not represented. Drawn by C. S. Minot. 



recti is very constant, but the obliqui vary considerably in 

 their origin in different Vertebrates. 



If a perch be cut through transversely, so that the section 

 passes through the fore-part of the 

 air-bladder, and the anterior portion 

 then looked at from behind, a very 

 instructive view will be obtained, as 

 in Fig. 401. The best sections can be 

 made by first freezing the fish. The 

 vertebral column ( V] appear? a little 

 above the middle ; overlying it is the 

 neural canal with the spinal cord ; im- 

 mediately beloAV it is the descending or 

 dorsal aorta (Ao), on either side of 

 which follow the kidneys (A"), resting 

 directly upon the air-bladder (Bt). 

 Lowermost is the body-cavity, Avith 



flip tnmnr>li ( <3'\ rmrl infaefT'nn / T,^\ F'K 401. Transverse sertion 

 (ft), and intestine (In), through the middle of the body 



surrounded by the liver, which has f . a cunner. -Drawn by c. s. 



MlllOt. 



been almost entirely removed. The 



rest of the section is occupied by muscles, which, it will thus 



b ' seen, make up the main bulk of the body. (Minot.) 



In 



