548 'Journal of Comparative Neurology and Psychology. 



general cutaneous fibers from the second IX-X root; it may 

 possibly contain other sensory fibers, communis or sympathetic. 



c. The rami supratemporalis and auricularis X. — Passing out 

 from the ganglion with the r. communicans is a small nerve that 

 evidently answers to the r. supratemporalis as described by vari- 

 ous writers. Its course out through the cranial wall is correctly 

 described by Kingsley. It is exclusively laterahs, and, as Kings- 

 ley suggests, supplies neuromasts in the occipital region. Anas- 

 tomosing with the terminal divisions of the r. supratemporalis 

 are branches of a second nerve springing dorsally from the IX-X 

 ganglion. It is composed of lateralis and general cutaneous 

 fibers. The general cutaneous component evidently corresponds 

 to the r. auricularis -vagi of the tadpole (Strong 1895), and to 

 the general cutaneous component of the nerve in Amblystoma 

 termed r. auricularis vagi by Coghill. 



d. The glossopharyngeal nerve. — General cutaneous, commu- 

 nis and motor fibers are contained in the glossopharyngeus, or 

 first branchial nerve, which divides just before or soon after it 

 leaves the ganglion into a r. pretrematicus and a r. posttrematicus. 

 According to Druner the r. pretrematicus is larger than the r. 

 posttrematicus and the r. communicans larger than either. Cross 

 sections of the three as they leave the ganglion show that ths r. 

 posttrematicus is the largest of the three, and the r. communicans 

 the smallest. The manner of branching of the r. pretrematicus 

 is so variable that it is difl!icult to make statements regarding it 

 at all accurate. Shortly after leaving the ganglion the r. pretre- 

 maticus gives off its principal branches. One small branch goes 

 ventrally to supply the dorsal wall of the pharynx ventral and 

 posterior to the ear capsule. Another branch which may be called 

 the pharyngeal proper (ph. IX.) is given off dorsally. From it 

 there passes a slender nerve anastomosing with the r. palatinus 

 VII, forming Jacobson's commissure. The fibers of this anas- 

 tomosis on entering the r. palatinus are seen to pass some cen- 

 trally and some peripherally. From the anterior portion of 

 Jacobson's commissure near where the latter joins the r. palatinus 

 there is given off a branch to the roof of the mouth. The pharyn- 

 geal branch sends an anastomosis to the r. alveolarisVII. The main 

 portion or ramus pretrematicus proper, passes ante ro-ventr ally and 

 mesally until the hyoid arch is reached. Thence, after dividing 

 sooner or later into two branches, it passes anteriorly a httle dorsal 



