(95) 



From this ganglion (Fig. 2 g.g.) nerve fibres pass to the Arteria 

 niesenterica inferior and to the peritoneum in wiiich they could be 

 traced unto the urinary bladder. In Echidna I found two separate 

 ganglia. In the topmost of the (wo enters the caudal limiting branch 

 from the sympathetic chord, from the other the nerve fibres run in 

 the same direction as I mentioned for Ornithorhynchus. 



When we compare Echidna and Ornithorhynchus, it appears that 

 Ornithorhjnchus approaches a little more to the condition of placental 

 mammals in so tar as in this species we find a little ganglion 

 cervicale supremum which is missing in Echidna and the S} mpathetic 

 chord does not enter directly into the suprarenal body as is tlie 

 case in Echidna. 



Description of figures. 



Fig. 1 : Sympathetic chord and principal branches of Echidna 

 aculeata 2. 



Fig. 2 : Sympathetic chord and principal branches of Oniithorhynchus 

 paradoxus 9. 



g. c. s. : ganglion cervicale supremum. 



g. c. : ganglion cervicale. 



n. 1. s. : nervus laryngeus superior 



r. e. n. 1.: ramus externus nervi laryngeï sup. 



r. c. : rami cardiaci. 



n. r. nervus recurrens vagi. 



n. ph. nervus phrenicus. 



a. s. d. : arteria subclavia dextra (too large in relation to the 

 other arteries). 



a. i. p. : arteria intercostalis prima. 



a. c. m. : arteria coeliaca -j- mesentcrica superior. 



g. s. r, : corpus suprarenale. 



n. : kidney. 



g. r : ganglion renale. 



g. g. : ganglion at the origin of the art. mesenlerica inferior. 



a. m. i. : Arteria niesenterica inferior. 



s. s. : left sympathetic chord. 



