112 NERVE COMPONENTS OF BONY FISHES, 



sally {cjit. X. 2). It goes cephalad and dorsad under the 

 mucous lining of the pharynx at the extreme mesal angle 

 of the gill cham.ber. Under the caudal edge of the 

 parotic process of the skull (640) it turns laterad and 

 somewhat caudad and dorsad and distributes in numerous 

 small branches to the skin adjacent to the lateral line 

 canal caudad of this point. 



From the cephalic face of the jugular ganglion the other 

 cutaneous ramus (r. opercularis vagi) arises by two roots, 

 both directed cephalad, one going ventrally, the other dor- 

 sally of the main vagus root, just cephalad of which (660) 

 they unite and, turning dorsad, continue cephalad 

 {r.op.X.). They appear to be composed exclusively of 

 cutaneous fibres, but as these roots are very minute and 

 their courses sinuous, it is impossible to be certain that at 

 their emergence from the general vagus root they do not 

 carry with them some communis fibres also. Some points 

 in their distribution suggest that they do, though most of 

 the fibres are clearly cutaneous, and as such all have been 

 entered upon the plot (Fig. 4). 



From the vagus root this twig goes cephalad and 

 slightly dorsad and laterad under the parotic process, and 

 at the origin of the m. adductor operculi runs laterally 

 between this muscle and the parotic process to a position 

 on the lateral face of the muscle between it and the levator 

 operculi (610). In this intermuscular space it continues 

 cephalad and ventrad and crosses the deep, or motor, 

 ramus opercularis VII. It passes externally to the latter 

 nerve and in contact with it, but there is no interchange 

 of fibres, as Baudelot ('83) states is the case in the 

 cyprinoids. 



Having passed below the ventral edge of the m, levator 

 operculi, it comes to lie between the m, adductor operculi 



