2/4 Journal of Comparative Neurology. 



the r. auricularis of Urodela is typically a general cutaneous 

 and lateralis nerve, and that it differs in this respect from the r. 

 auricularis of Anura. 



The rr. laterales superior and inferior of Urodela, so far as 

 they have been investigated, seem to agree perfectly with those 

 of Amblystoma. One apparent exception to this arrangement, 

 however, occurs in Spelerpes. In this species, Bowers ('oo. 

 Figs. I, 2, nn. Scap f) describes a nerve which agrees in origin 

 and position with the r. lateralis inferior of other authors, but 

 represents it as a motor nerve (p. 191). As pointed out in Part 

 First, this nerve in Amblystoma sometimes assumes intricate 

 relations with the brachial nerves and penetrates muscles in 

 such a manner that its course becomes obscure, but its relations 

 are usually perfectly clear. There can be no doubt of its 

 lateralis nature in other Urodela, and it is extremely improb- 

 able that its exact position should be assumed by a motor nerve 

 in Spelerpes. 



^. — The R. Coniiniinicans IX-\-X ad VII. 



This branch of the t. glossopharyngeus was treated by 

 earlier anatomists as belonging to the ninth nerve. Strong 

 maintains that the nerve in anurous larvae is general cutaneous 

 and therefore belongs to the vagus, there being no such com- 

 ponent in the glossopharyngeal root. Bowers figures the 

 nerve as general cutaneous in Spelerpes, but retains the name 

 " r. communicans IX ad VII." 



DRtTNER, in his recent work on Urodela, treats this nerve 

 as purely motor in function. My studies of Amblystoma, 

 however, show conclusively that the nerve contains general 

 cutaneous fibers from the vagus and communis fibers from the 

 glossopharyngeus. The general cutaneous fibers I have inter- 

 preted as entering the r. jugularis and the communis fibers, as 

 entering the r. alveolaris. The passage of the communis fibers 

 into the r. alveolaris has not been noticed in other Urodela, 

 though Fischer ('64) probably observed it in Siredon since he 

 mentions a band of fibers which passes from the r. jugularis 



