500 MR. F, E. BEDDARD ON THE [ Apr. 27, 
of the latter into the postcaval. The inner vessel, running of 
course parallel with the outer branch, crossed over the lumbar 
and reached the ovary. There was no junction between this mi 
and the main ovarian trunk, which I shall describe directly a 
opening straight into the posteaval, except perhaps quite distally, 
where the smaller branches of both these veins may anastomose 
on and about the ovary. 
On the left side the veins in question were somewhat different. 
There are, however, two of them, as on the right side. Anteriorly 
these two veins cross and anastomose with each other more than 
once, and one of them appears to be connected directly with the 
kidney of the left side. Posteriorly the two vessels are again 
united by a short transverse trunk on a level with the posterior 
ovarian veins. Both these vessels appear to reach the ovary. 
With the left lumbar parietal vein is connected a forwardly 
running branch, as on the right side. Jt occupies an entirely 
corresponding position, but does not form either of the ovarian 
veins just described. It gradually dies away anteriorly. Between 
the left renal vein and the lumbars already spoken of are four 
intercostal veins. On a level with the last of these and rather 
asymmetrically (the left being in front of the right) enter the 
posterior ovarian veins. 
Of a few other Marsupials I have less complete notes upon 
these various veins. Ina specimen of Zvrichosurus fuliginosus* 
the two renals were very asymmetrical, the left being much below 
the right in its point of entry into the postcaval ; the two anterior 
sper matic veins were present, and the left certainly, and the right 
probably, flowed into each renal. Whether they segues 
with the posterior spermatics I am not certain, but I think that 
they did not. The latter veins were also asymmetrical, the right 
opening into the postcaval below the left. 
A second example of TZrichosurus fuliginosus showed some 
additional features of which I had not made notes in the first 
example. The asymmetry of the posterior ovarian veins seems 
to me to be explained by this specimen. When the right vein is 
earefully examined it is seen not to enter the postcaval, where it 
appears to enter, i.e. just opposite to the entry of the left ovarian 
vein. From this point it runs forwards, closely adhering to the 
posteaval vein until it reaches the next intercostal vein, in common 
with which it opens into the postcaval. Whether there i is or is 
not a connection also with the intercostal lying next behind the 
one just referred to—and I am inclined to think that there is 
not—we have here, as I believe, a retention of a more anterior 
section of the postcardinal than is retained on the left side. This 
appears to be shown by the course of the vein strictly parallel to 
and in close contact with the postcaval (i. e. the right subcardinal, 
* In all the species which I describe here the postcaval lies below (7. e. accu- 
rately above, en a dissection from the ventral surface) the aorta. This fact, clearly 
unusual among Marsupials, was first discovered by Owen, as both Hochstetter and 
McClure have pointed out in their memoirs. 
