68 DE. C. F. SONNTAG ON THE VAGUS AND 



(text-fig. 30). The nerve gives off the external laryngeal nerve 

 and enters the larynx through the thyro-hyoid membrane, or 

 through an opening in the thyroid cartilage. It is sometimes 

 seen to communicate with the recurrent nerve, but never in such 

 a complete manner as that described in Hyrax capensis (6). _ No 

 trace of a depressor nerve was seen in any of the animals described 

 in the present paper, although it is described by several authors 

 as existing in Felis domestica. 



As the middle cervical sympathetic ganglion is absent, no 



Text-figure 3. 



L-P.N. 



The upper cervical parts of the vagus and sympathetic nerves in : A. JFelis 

 hengalensis ; B. Munffos ichneumon : C. Canis tkotis ; D. Frocyon lotor ; 

 G.R : root ganglion of the vagus ; a.n : Arnold's nerve. Other letters as in 

 text-fig. 1. 



communicating twigs are given off from the vagus till the root 

 of the neck is reached There the sympathetic is given off and 

 communicating branches run again between vagus and sym- 

 pathetic. They run to the sympathetic cord itself, or to the 

 inferior cervical ganglion of the sympathetic (text-figs. 4-11). 

 In Procyon lotor they run from the vagus to the annulus of 

 Vieussens. 



The cervical part of the oesophagus is supplied by the pharyn- 

 geal and, in some cases, the recurrent laryngeal nerves. 



