554 Dr. G. E. Nicholls. Intracranial Ganglion upon the 



This specimen had been sectioned in the transverse plane and is the one 

 from which the text-figure has been drawn. The cells are seen on either side, 



Lower part of a Transverse Section through the Brain of Scyllium canicula, taken at the 

 level of the origin of the oculomotor nerves, and showing some of the ganglion cells 

 slightly diagrammatically. 



(Outline with camera lucida. x 14 approx.) 



at about the same distance from the superficial origin of the nerve, in a group 

 extending between points roughly 1*5 mm. and 2 mm. from that origin. On 

 the one side some 50 odd ganglion cells were counted, while upon the opposite 

 side there were about 70. The exact numbers cannot be certainly stated, for 

 it is probable that in some cases a cell may have been reckoned twice, appear- 

 ing, as they do, each in several adjacent sections. They were accompanied by 

 smaller cells, the nuclei of which stained much more deeply, the whole forming 

 a quite obvious ganglion. 



My remaining series of S. canicula brains, in every case, showed the third 

 nerves cut at a point nearer to the brain than that at which the ganglia might 

 be expected. 



Another series, therefore, was cut transversely specially for this investiga- 

 tion, care being taken to remove the brain with as much as possible of the 

 third nerves attached. The ganglionic masses were found well marked and 

 were composed of cells of the same character and in about the same number 

 as in the case described and figured above. 



The discovery of even a small ganglionic mass related to the third cranial 



/ 



N. Oculomotor 



