1 66 Journal of Comparative Neurology. 



surface of the fasciculus longitudinalis dorsalis and beforclcaving 

 the latter contributes a considerable bundle of fibers to it. 



10. The auditory nctvc terminates in the tuberculum acus- 

 ticum, and its fibers are internally so mingled with the lateralis 

 fibers from the X and VII nerves that analysis is impossible in 

 Weigert preparations. 



11. The sensory VII roots contain two components. 

 The connmmis portion, enters the fasciculus communis, com- 

 prising the whole of that tract except the fibers received 

 from IX. It terminates in the lobus vagi, a lobus trigem- 

 ini not being developed. This communis root enters the 

 geniculate ganglion and distributes to ( i ) the r. palati- 

 nus (comprising the whole of that nerve) for the mucosa and 

 taste buds of the roof of the mouth ; (2) the truncus hyo-man- 

 dibularis VII for the mucosa and taste buds of the inside of 

 the lower jaw and lip ; (3) the r. maxillaris V to taste buds 

 within the upper lip ; (4) the r. recurrens VII. The latter 

 fibers pass dorsally into the cranial cavity, forming in the men- 

 inges an elaborate plexus, finally to combine into the r. recur- 

 rens which runs the length of the body superficially near the 

 dorso-median line. These communis fibers supply some terminal 

 buds on the top of the head and some others probably run for- 

 ward with the ophthalmicus superficialis. In addition to the 

 above there is (5) a small twig which leaves the geniculate gan- 

 glion between the truncus hyo-mandibularis and the r. palatinus 

 running directly ventrally to the roof of the mouth, supplying 

 its mucosa in the region between the areas supplied by the IX 

 and palatine nerves. In its course it passes along the cephalic 

 face of and innervates the very large pseudobranch. This is 

 the only nerve supply which that organ possesses, and this 

 nerve is accordingly, I think, to be regarded as the pre-trcmatic 

 VII nerve, the pseudobranch representing a spiracular gill and 

 the truncus hyo-mandibularis the post-trematic VII. 



12. The second sensory component of the VII nerve is 

 represented by two lateral line roots, (a) The ventral lateralis root 

 has a separate ganglion and supplies organs of the opercular 

 and mandibular canals, via the truncus hyo-mandibularis. (b) 



