20 PISCES. 



PLATE YI. 



THE SYMPATHETIC NEBYE OF THE COD. 



(GADUS MOREHUA.) 



IN the preparation from which this plate has been taken, the parts constituting 

 the thorax, the abdominal muscles and portions of the gills have been removed ; the 

 oesophagus has been detached, and the air-bag laid open ; the bloodvessels are seen 

 passing down from the gills and uniting and sending off the mesenteric artery and 

 forming the aorta to be continued down the middle of the spine. 



a, oesophagus ; 5, stomach ; c, liver ; d, right ovary. 



1. Large branches of the fifth supplying the muscles and skin of the head and 



face and membrane of the mouth. 



2. A nerve proceeding from one of the bundles about to form a trunk of the par 



vagum ; it communicates with the auditory nerve, and passes to the first 

 partition of the gills, and gives off filaments to the pectinated processes. 



3. Right trunk of the par vagum, giving branches to the gills and muscles 



connected with these parts, sending two outwards and downwards underneath 

 the skin of the side, and a larger one to the stomach. 



4. A small branch, given off by the trunk of the par vagum to pierce the air-bag 



and terminate on the parenchymatous structure, similar in appearance to the 

 lungs. 



