146 STRONG. [Vol. X. 



A few coarse fibres remaining in the main nerve soon 

 separate and appear to innervate a minute muscle lying near 

 the one previously described, and which might be identified as 

 Schulze's M. basihyobranchialis. The main nerve (^b^ then 

 proceeds cephalad in the floor of the pharynx, giving off twigs 

 to its epithelium. It finally terminates at the rudiment of the 

 tongue, taking at this point a sharp little turn mesad. This is, 

 of course, the R. lingiialis glossopharyngei. 



Returning to 654, the posterior division {()b^y consisting of 

 mixed fibres, proceeds caudad and ventrad along the inner side 

 of the body wall until at 740 ± it curves, first ventrad and then 

 dorsad and ectad (rvj-shaped), around the angle of a fold of the 

 body cavity wall and thus becomes subcutaneous. The bulk of 

 it proceeds cephalad and lies, at 698 ±, near a lateral line branch. 

 It breaks up to supply the skin of this region and ventral to 

 this. It is at once apparent that this posterior branch is 

 similar to the two twigs (6 c and 7 a) given off by the two 

 previously described Vagus branches, one of which could be 

 traced to a cutaneous distribution. 



Returning to 854, the other inner division of mixed fibres 

 {10) is the R. communicans ad facialew, to the R. hyomandibu- 

 laris. Its final distribution is described in connection with the 

 latter, and it has there been found to be a general cutaneous 

 nerve. 



Now that the branches have been described, their relations 

 to the ganglia may be made more intelligible. As described 

 above, the most distal ganglion (Q, from which issues the R. 

 lingualis, belongs to the fine fibred portion of the nerve at this 

 point. The larger mixed fibres which pass off into the R. 

 communicans ad facialem and the cutaneous branches do not 

 appear to be ganglionated here. The majority of them form a 

 bundle on the inner side of the nerve next to the auditory 

 capsule. As we pass further proximad along the nerve trunk, 

 the fine fibres cease to be ganglionated and form the wedge- 

 shaped bundle mentioned, occupying the outer central part of 

 the trunk. 



The proximal portion of this ganglion is slightly overlapped 

 externally by the second ganglion {B). From the distal apex 



