Johnston, Nerves of Petromyzonts. 



587 



Fig. 16. 



Fig. 17. 



Fig. 16. Ramification of the dorsal branch of the ramus visceralis of the IX nerve in the dorsal 

 wall of the respiratory tube, g.a., gill arch; o.b., oesophageal bundle continued in fig. 17. Magnifica- 

 tion, 50 diameters. 



Fig. 17. Ramification of a branch, o.&./.Y, from the ramus visceralis IX in the oesophagus (oei.). 

 Magnification, 80 diameters. 



