NERVUS TERMINALIS IN AMIA 



93 



half of them were situated near the entrance of the nerve into 

 the cranial cavity (at point a in fig. 25), while the remainder were 

 found along the posterior branch of the nerve near the paraphysis 

 and the pallial wall of the forebrain (at point b in fig. 25). The 

 latter ganglion is situated in close proximity to the base of the 



rue 



cartilage 



--ant. di.en.ceph.aUc sac 



-ciliary dano"! ion 

 -pineal stalk 

 -■--profundus dantflion 

 paraph, ysis 

 profundus nerue 



Fig. 25. Diagram showing dorsal view of the anterior end of adult Amia brain. 

 Made from gross dissections with the aid of Weigert preparations of a young Amia 

 100 mm. long, to show the relation of the profundus nerve to the ramus which in- 

 nervates the meninges of the forebrain. Also, it shows the relation of the pre- 

 optic sympathetic system to the pineal nerve and to the nervus terminalis. X 4. 



dorsal sac (fig. 30) and near the origin of the diencephalic sacs of 

 Kingsbury ('97), from the third ventricle. In total mounts of 

 the intra-cranial part of the nerve, sheath cells can be seen sur- 

 rounding the large nerve cells (fig. 26). The cells show tigroid 

 bodies and are of the same size and character as those of the pro- 



