140 EDWARD PHELPS ALUS, JR. 



third bundle to the nervus lineae lateralis, and a fourth to the 

 extracranial communis ganglion of the complex. The fibers of 

 the latter bundle lie in the deeper part of the ganglion, in contact 

 with the mail;! sympathetic nerve, and it is impossible to trace 

 the two sets of nerves independently. The combined fibers 

 separate into two bundles which run to or toward two sympa- 

 thetic ganglia described immediately below. 



The communis ganglion is an elongated structure, the anterior 

 portion of which is enlarged to form an independent ganglion 

 for the first vagus nerve, while the posterior portion separates 

 imperfectly into three parts which are Telated, respectively, to 

 the second, third, and fourth vagus nerves. On the ventral 

 surface of the ganglion there are two small swellings which 

 represent the sympathetic ganglia above referred to, one related 

 to the first vagus ganghon and the other to the second, third, 

 and fourth ganglia. From the communis ganglion fibers are 

 sent to the ramus supratemporalis, the nervus lineae lateralis, 

 and the several vagus nerves, and from the sympathetic ganglia 

 fibers are sent to the several vagus nerves. These latter fibers 

 are quite probably in part general sensory, but as this could not 

 be definitely established, they will be referred to as sympathetic. 



The ramus supratemporalis contains general sensory, com- 

 munis, and lateralis fibers, and certain of its branches form, on 

 the dorsal surface of the chondrocranium, a closed circuit with 

 branches of the ramus oticus facialis and the ramus supratem- 

 poralis glossopharyngei. No branch of the nerve forms an 

 anastomosis with branches of the ramus opercularis, as occurs 

 in Amia and the Teleostei. 



The first vagus nerve is represented by several branches which 

 arise independently from the first vagus ganglion. One of these 

 branches is a communicating branch from the first vagus gan- 

 glion to the glossopharyngeus ganglion, and it contains both 

 communis and sympathetic fibers, the latter doubtless being 

 accomparued, as above explained, by general sensory ones. A 

 second branch, also accompanied by sympathetic fibers, sepa- 

 rates into two parts, one of which is the ramus pharyngeus and 

 the other the ramus pretrematicus internus. The ramus phar- 



