136 



ME. P. E. BEDPABD ON DENDEOLAGUS BENNETTI. [Feb. 5, 



The azygos vein shows considerable differences in different 

 Marsupials ; and I may take this opportunity of putting together 

 the results of some recent dissections. In Doidrolagus there 

 is nothing remarkable, the azygos is on the right side ; but in 

 Halmatunis hennetti there are two posterior cardinal veins nearly 

 equally well developed, but longest on left side. In two specimens 

 of this species dissected by me there were differences : in one the 

 left azygos was much longer than in the other. Petrogale ^jen?'ct7- 

 lata agreed with Dendrolagiis ; so too Macropus rufus. In Phalan- 

 yista vulpina the difference was that the azygos vein was developed 

 on the left side. In one specimen of the last-mentioned Marsupial 

 the azygos opened directly into the vena cava posterior opposite to 

 the entrance of the left kidney vein. The vena cava moreover was 

 very largely absent. This state of affairs did not exist in the other 

 individual. In Didelphys cancrivora and Dasyurus maugcei the left 

 azygos vein was also developed and not the right. In Didelphys 

 azarce the same was the case, only the vein opened posteriorly into 

 the vena cava opposite to renal vein ; but the vena cava was not 

 absent in front of this point. 



§ The Brain. 



I have compared the brain of Dendrolagus with those of Petro- 

 gale penicillata and Halmaturus hennetti. It is about as large as 

 that of the latter and bigger than the brain of Petrogale. The 

 furrows are, however, less mai'ked than iu either of the types 



Fig. 6. 



Lateral view. 



Dorsal aspect. 



Brain of Dendrolagus. 

 8y., Sylvian fissure ; h anterior, a posterior fissure 



