Johnston, Nerves of Petromyzonts. 



571 



In fig. I appear the ganglia and roots of the V and IX nerves, 

 the root of the VII nerve within the auditory capsule, the VII-X 

 connective of lateral line fibers (//) on the outer surface of the 

 auditory capsule, the combined roots of the i and 2 ventral spinal 

 nerves (1-2) just behind the glossopharyngeus, and a segment 

 of the epibranchial trunk {tr.ep.) with the stump of the first bran- 



FiG. 3. Section 43. 



Fig. 4. Section 



chial nerve going off from it. Within the brain case appears the 

 root of the third nerve and also two fine fibers which are appar- 

 ently related to the meninges. 



The section from which fig. 2 was drawn passes through the optic 

 chiasma (ch.). A part of the root of the trigeminus is still present 

 and in its ganglion appear the cells and fibers of the velar nerve 

 to be described below. The fibers which cross the root and 



