248 THE ELASMOBRANCH FISHES 



ciliary nerve. Norris and Hughes say that in Squalus acanfhias these ganglia 

 are connected by fibers with the oenlomotoris, the ophthalmicus profundus V, 

 and the palatinus VII nerves. 



In sharks the sympathetic system in the trunk is divided into two parts. The 

 anterior part only is associated with the suprarenal bodies. The first trunk 

 ganglion (s.g., fig. 225) of this system is the result of a fusion of several 

 ganglia and farther it is fused more or less intimately with the first supra- 

 renal body. It receives many fibers from the anterior spinal nerves and gives 

 ofif splanchnic fibers to the viscera. The ganglia in the posterior region are 

 small and are separated from the suprarenal (interrenal) bodies. Further- 

 more, these ganglia of the sympathetic system seldom have connecting strands 

 putting the various ganglia of a side in longitudinal communication, as occurs 

 in the higher animals. The posterior ganglia are never thus connected into a 

 longitudinal chain. From the posterior ganglia fine branches go to the kidneys 

 and the genital ducts as well as to the posterior viscera. 



