358 H. W. NORRIS AND SALLY P. HUGHES 



ninth nerve of Lota. Herrick ('01) describes a lateral-line com- 

 ponent in the glossopharyngeus of Ameiurus melas, derived, 

 however, from the vagus, which supplies one canal organ and 

 two pit-organs. The writers find in Mustelus californicus a 

 small lateral-line ganglion upon the ninth nerve in essentially 

 the same position as the one in Squalus, from which a nerve 

 proceeds dorsally, contributing two ramuli to the lateral-line 

 canal. In one specimen examined a single ramulus occurs. 



Cole ('98) says that the glossopharyngeus takes' "no part in 

 the innervation of the system [lateralis] either in Gadus or mor- 

 phologically in any other form." Kingsbury ('97) finds a lat- 

 eralis constituent in the ninth of Amia, but derived from the 

 main lateral-line nerve. Allis ('97) says that the lateral-line 

 element in the glossopharyngeal nerve of Amia is derived from 

 the root of the lateral-line nerve of the vagus, but in the larva 

 bears a distinct ganglion. 



3. The ramus supratemporalis IX 



From the small lateral-line ganglion on the root of the glosso- 

 pharyngeus all the fibers pass dorsoposteriorly as a single minute 

 nerve, through a short canal in the lateral wall of the ear cap- 

 sule, to the dorsal side of the head. Thence running anteriorly, 

 they are distributed through three terminal ramuli to that part 

 of the main lateral-line canal between the distribution areas of 

 the ramus oticus VII and the ramus supratemporalis X. No 

 pit-organs are connected with the ninth nerve, nor are somatic 

 sensory elements found in it. Houser ('01) mentions and figures 

 general cutaneous fibers in the ninth nerve, and also states their 

 occurrence in the tenth nerve, of Mustelus canis. 



4. The first branchial nerve 



The glossopharyngeal nerve in Squalus may be taken as an 

 example of a typical branchial nerve. It consists of four rami: 

 lateralis, pharyngeal, pretrematic, and posttrematic. The post- 

 trematic, however, is itself distinctly double. All but the lat- 

 eralis contain visceral sensory elements, the posttrematic dif- 



