NERVUS TERMINALIS IN AMIA 105 



region of the posterior ventral margin of the olfactory bulbs . If one 

 had found the nervus terminalis but had failed to find the intracran- 

 ial sympathetic fibers posterior of the olfactory bulbs, he might have 

 supposed that the fibers in the fold of the membranous pallium 

 between the forebrain and in the meninges ventrally were roots 

 of the nervus terminalis as Allis apparently did, but I have satis- 

 fied myself from my preparations that the bundle of fibers in the 

 median fold of the membranous pallium is a part of the system 

 of fibers innervating the meninges of the fore-brain (figs. 22 

 and 32.) 



In concluding the description of the intra-cranial sympathetic 

 fibers of the meninges of the forebrain of Amia, it can be said that 

 there is ample opportunity for connection between the nervus 

 terminalis and the post-optic sympathetic system. There is a 

 constant bundle of about six non-medullated fibers that can be 

 traced in fishes 75 mm. long from the optic chiasm to the -region 

 of the nervus terminalis (fig. 32). Cajal preparations of the adult 

 show that there may be three times as many fibers in this bundle at 

 maturity. This bundle has not been traced into the brain near 

 the optic chiasm as Allis ('97) seemed to think might be the case, 

 but in many preparations I have connected it by a bundle of 

 fibers following the blood vessels dorsad, with the fibers entering 

 the cranial cavity from the profundus nerve (fig. 25). The nature 

 of the Golgi impregnations on which I have had to depend to a 

 large extent for tracing these intra-cranial fibers does not permit 

 of demonstrating the connection between the nervus terminalis 

 and the posterior portion of the sympathetic as clearly as would 

 be the case with medullated fibers by the Weigert method, but 

 the slightly diminished bundle of fibers of fig. 22 certainly 

 continues rostrad along the carotid artery beneath the olfactory 

 nerve, while the fibers of the nervus terminalis just as certainly 

 become more or less distinctly separate from the olfactory nerve, 

 after it enters the cranial cavity, and run near this same artery 

 (figs, 10, 11, and 12). 



It seemed quite probable to me at first that a connection might 

 exist between the peripheral ganglion cells of the nervus terminalis 

 in the nasal capsules of Amia and the post-optic sympathetic 



