Herrick, Oanial Noves of tJie Cod Fish. 275 



run forward for a long distance in a sheath of connective tissue 

 lying in the membranous cranial wall mesially and later ven- 

 trally of the ventral tip of the supra-orbital cartilage. Still 

 farther forward they run intra-cranially under the supra-orbital 

 canal, which lies in the lateral edge of the frontal bone. 



I confirm Cole's account of the peripheral course of the r. 

 ophthalmicus superficialis VII. 



From the dorsal tip of the geniculate ganglion an exceed- 

 ingly minute twig of communis fibers runs forward and over 

 the trigeminus root (Figs. 6 to 9, com. opJi. sup.') to take a po- 

 sition in the extreme dorsal part of the Gasserian ganglion close 

 under the r. ophthalmicus superficialis VII. Here it continues 

 cephalad along the dorsal edge of the r. ophthalmicus super- 

 ficialis V until this nerve gives off its first branch. It is impos- 

 sible to be certain of the course of these fibers ; but it appears 

 from the sections that most of these fibers entei this first 

 branch. 



Immediately cephalad of the Gasserian ganglion the r. 

 oph. sup. V sends a large branch outward, mentioned just 

 above, which pierces the membranous cranial wall uiider the 

 supra-orbital cartilage, then turns dorsad and cephalad along 

 the outer side of this cartilage. This position, however, it soon 

 leaves, turning laterally to spread out in the tissues over the 

 eye-ball and in the overlying skin. One large twig luns down 

 upon the cornea. Another runs forward parallel to the main 

 nerve where over the middle of the eye it joins a brauchlet of 

 r. oph. sup. VII destined for pit-organs and derived Irom the 

 nerve for supra-orbital canal organ 5. 



The observations upon the communis component of the 

 supra-orbital trunk could not be controlled on the opposite side 

 of this fish. The number of these communis fibers is so small 

 that their exact course is not a matter of great importance. It 

 is clear from this reason alone that they supply no considerable 

 number of terminal buds anywhere, and it is quite as probable 

 that they are of general visceral nature and do not go to the 

 skin at all. 



At the level of the last (5th) supra-orbital canal organ a 



