Johnston, Nerves of Petromyzonts. 



573 



nerve which in the previous section comes from the trigeminal 

 ganghon. Behind the neuromast ganghon is the root of the VII 

 nerve proper which has emerged from the auditory capsule. 

 Latero-caudal to the capsule are the spinal ventral nerves i and 2 



Fig. 8. Section 60. 



Fig. 8a. Sections 66, 67, 68; this includes the skin and parietal muscle beneath the orbit and 

 corresponds in position to that part of Fig. 8 opposite to which it stands. 



which are passing cephalad with the ventral divisions of the first 

 and second postotic myotomes (Neal 1897). The trunk of the 

 sympathetic here continues forward over the first gill sac which 

 comes into view for the first time. The IX and first division of 

 the X nerve are passing down mesal to the branchial cartilages. 



