566 



DR. C. F, SONNTAG ON THE COMPARATIVE ANATOMY 



and some of them ramify; so dense is the venous plexus that 

 the ureter is concealed by them. At first sight it looks like a 

 cord of veins. 



• John Hunter (22) showed that the relative positions of the 

 kidneys of Petaurus taguanoides are similar to the above. 



( Text-figure 61. 



L / i^ e /- 



tjff.S.P.C. 



A. heart and aorta of Phascolarctos cinerezis with origins of right subclavian, 

 right common carotid, left common carotid, and left subclavian arteries, from 

 right to left, and described in text as a, b, c, d: B. heart and aorta of 

 Tricliosiirus vulpecula : C. kidneys and some of the abdominal veins : 

 i.s.E.c. and k.s.e.c, suprarenal capsules ; p.i., peritoneal ligament : D and 

 E. origins of vertebral arteries in Phascolarctos cinereus and Tricliosurus 

 vulpecula respectively : P and G. spleens of Tricliosurus vulpecula and 

 Phascolarctos cinereus respectively. 



