AND MYOLOGY OF THE MARSUPIALIA. 



875 



panies the right vagus on the dorsal aspect on the oesophagus. 

 And no branches of communication ran between the vagi*. In 

 Perameles obesula the cords have a similar disposition, but com- 

 municating branches run between them. 



The conditions ai'e more complex in Dendrolagus ursimis 

 (text-fig. 79 A). The vagi are linked together by numerous 

 branches of communication (c.b.v). The left one has a large oval 

 expansion (ev) beyond which it bifurcates, and the right half fuses 

 with the right vagus. The branches of supply to the oesophagus 

 are very numerous. 



Text-figure 79. 



The vagus and sympathetic in Dendrolac/us ursiuus. A. In anterior two-tliirds of 

 thorax. B. Posterior thoracic and abdominal parts. 0^:1. oesophageal plexus ; 

 tp. tracheal plexus ; y. right cardiac branches of vagus ; (/. pulmonary nerves ' 

 C.P.G. ganglia of caixliac and pulmonary plexuses. Other letters in text. 



In no case did I find any communication between the vngus 

 and phrenic nerves. 



Abdominal Parts of the Vagi: — The vagi terminate in three 

 ways in the Marsnpialia. The combined trunk ends in the solar 

 plexus, and gives branches to the stomach in the Koala as in some 



* In N'andinia linotata, the most primitive Carnivore, the conditions resemble 

 t\iO%e iw Jletacliirus . 



