NERVES OF THE DOGFISH 



339 



the ramus mandibularis, however, but passes along the anterior 

 border of the latter, thence ventrally, laterally, and anteriorly, 

 to the base of the eyelid, then turning posteriorly it passes along 

 the internal border of the jugular group of ampullae of Loren- 

 zini, becoming smaller and smaller as it is distributed to the 

 cutaneous tissue (fig. 35, mxpc). 



^&£^&Qa|g> -■- ^^iLs" 



Fig. 34 A cross-section through the optic chiasma, showing structures in the 

 angle between the ventrolateral brain wall and the ventromesial wall of the eye- 

 ball. Section 692. X15. 



THE FACIAL NERVE 



1 . The lateral-line roots and ganglia of the facial nerve 



The roots of the lateral-line component of the facialis enter 

 the medulla in two divisions: a dorsal root passing into the T at- 

 eral-line lobe and a ventral root entering the acusticum (figs. 

 36, 12 to 14, 21, 22, 35, and 51, Vllrlld., Vllrllv.). A horizontal 



THE JOURNAL OF COMPARATIVE NEUROLOGY VOL. 31, NO. 5 



