144 STRONG. [Vol. X. 



having in the meanwhile, like the other, passed around to the 

 dorsal side of the cartilage and lying in the gill-raker attached, 

 bends mesad, nears the place of transition of the gill membrane 

 into pharyngeal epithelium, and rounds the extremity of a 

 small, pouch-like evagination, or pocket, of the pharyngeal 

 cavity, which projects anteriorly. The distribution of this 

 nerve seems to be in every respect similar to the preceding 

 one. It also contains ganglion cells. This branch is also 

 obviously a R. branchialis. 



At 923, at about the point of separation of the last two 

 branches, the remainder of the trunk of the IX + X becomes 

 ganglionated. A wedge-shaped bundle in the outer central 

 portion of this part of the trunk consists exclusively, or nearly 

 so, of fine fibres, the other portions contain mixed fibres. The 

 ganglion cells are small and seem to be confined especially to 

 the fine-fibred portion. 



At 897 a small twig (<S) separates from the inner side of the 

 trunk. It is coarse-fibred, and proceeds ectad and cephalad 

 from under the edge of the auditory capsule and then turns 

 directly cephalad in the lowest, loose connective tissue, layer of 

 the skin. At 838 it divides. The two divisions proceed 

 cephalad and probably supply lateral sense organs, though only 

 traceable to their vicinity. Its fibres resemble those of the 

 other lateral line branches, and it is the portion which has been 

 described above (p. 139) as separating from the ventral division 

 of the lateral line bundle while in the vago-glossopharyngeal 

 complex. It is this small branch which has been described in 

 fishes by several observers as arising from the IX and innervat- 

 ing a canal organ, and which has been confused with the R. 

 cutaneus dorsalis (auricularis vagi) in the frog {vide supra). 

 It may be called the R. supratemporalis. 



At 854 the main trunk of the IX + X falls into two divisions. 

 The outer of these divisions (0 comprises the exclusively fine- 

 fibred bundle and a portion of the mixed fibres, viz., that portion 

 on the outer side of the fine fibres. The inner division (/O) 

 comprises the remainder of the mixed fibres. The ganglion 

 cells still found in the outer division are in the fine fibred 

 portion. 



