142 EDWARD PHELPS ALLIS, JR. 



accompanies, or anastomoses with, the ramus pretrematicus 

 internus of the second vagus, the nerve so formed continuing 

 onward through the arch. The ramus posticus first sends a 

 motor branch to the levator muscle of the arch and then one to 

 the adductor muscle, the latter branch running downward on 

 the posterior surface of the epibranchial, as Danforth ('13) has 

 stated. The nerve then continues onward in its arch and 

 innervates the muscles at its ventral end. 



The second and third vagus nerves arise from their respective 

 ganglia and have branches that correspond strictly to those 

 above described for the first vagus, the communicating branches 

 from the third ganglion to the second, and from the second to 

 the first, apparently being represented by parts of the large 

 communis ganglion. The fourth vagus nerve also has all these 

 several branches in addition to the large ramus intestinalis. 



The root of the nervus glossopharyngeus apparently contains 

 only motor and communis fibers, but it receives an intracranial 

 branch from the root of the nervus lineae lateralis. The root 

 issues from the cranial cavity through an independent foramen 

 and passes ventral to the vena jugularis, a ganglion then imme- 

 diately forming upon it. On the ventral surface of this ganglion, 

 and partly imbedded in it, there is a small sympathetic ganglion 

 which receives the communicating branch from the first vagus 

 ganglion, above described. From this communis ganglion a 

 supratemporal branch arises, and contains, in addition to com- 

 munis fibers, all the lateralis fibers of the nervus. It runs dor- 

 sally, mesial to the vena jugularis and then along the lateral 

 surface of the chondrocranium, anastomoses with the closed 

 circuit formed by the ramus oticus facialis and the ramus supra- 

 temporalis vagi, and is distributed to certain of the laterosen- 

 sory organs of the main infraorbital laterosensory canal and to 

 adjacent nerve pits. 



From the anterior end of the glossopharyngeus ganglion a 

 ramus pharyngeus arises, and soon separates into two parts. 

 One of these parts anastomoses with a branch of the ramus 

 palatinus facialis which issues from the chondrocranium by an 

 independent foramen, the fibers of the glossopharyngeus appar- 



