SYMPATHETIC NERVES OF THE TERRESTRIAL CARNIVORA. 



75 



and I could neither observe it in the neck nor in the carotid 

 canal. In other species it is round, oval, or pyriform, but its 

 posterior pole is never bifurcated. It communicates with the 

 ninth, tenth, and twelfth cranial nerves, and it sends branches 

 to the pharyngeal plexus. The internal carotid nerve {i.c.n.) is 

 single or multiple. Rami communicantes also run to the upper 

 cervical spinal nerves. 



The superior cervical ganglion and ganglion nodosum are fused 

 in Nandinia hinotata (text- fig. 1 A), but in other animals the 

 former rests on the vagus nerve, or is connected to it by a 

 sympathetic cord (S.) of variable length. In only a few species 

 (p. 65) is the sympathetic always separate from the vagus. 



Text-figure 9. 



A. Thoracic parts of the vagus nerves in Ictonyx zorilla ; B. Plexus gulas 

 in Fy-ocyon lotor. Letters as in text-fig. 4. 



In no case is there a middle cervical ganglion. 



When a vago-sympathetic cord is present it is usually resolved 

 again into its component elements in the posterior third of the 

 neck. But in Ganis thous (text-fig. 5) the vago-sympathetic 

 passes into the thorax, and expands into an oval mass whence 

 the sympathetic runs cranio-laterad. The sympathetic enters 

 the inferior cervical ganglion or the first doi'sal ganglion when the 

 former is absent. 



The inferior cervical ganglion (text-figs. 4, I.O.G.-ll, I.C.G.) is 

 absent in Putorius vison, Atilax paludinosus, Genetta felina, and 



