1909. | POSTCAVAL VEIN IN MAMMALS. 503 
more asymmetrical. Both renals, it ought to be stated, were 
single veins, as in the last specimen. The suprarenal of the left 
side entered the postcaval just at its junction with the left renal. 
The posterior ovarian veins were nearly but not absolutely 
symmetrical, the right-hand vein being just a shade above the 
left. The “ieee ovarian veins were double on each side, and 
certainly anastomosed with the posterior ovarian on each side, 
where they passed dorsal to it. The two veins—closely following 
the ureters, as is the case in other Marsupials—were connected to 
each other by numerous anastomoses, and the conditions were 
the same on both sides of the body. Between the entrance of 
the renal vein (left) and the point of entrance of the two posterior 
ovarian veins I counted three rather slender intercostal veins, of 
which two were distinctly on the right side of the postcaval, and 
one (the last) as distinctly on the left side. The lumbar parietal 
veins opened into the iliac a considerable distance from the bifur- 
eation of the postcaval, and were directed anteriorly in their 
course. 
In Macropus parryi the typical Marsupial conditions are met 
with. The example which I dissected was in very good condition 
for the examination of the veins; for these vessels were turgid 
with blood and the smaller branches could be followed with ease. 
The renal veins are roughly symmetrical: there were two of them 
on the right side and one on the left; the left renal vein divided 
into three before entering the kidney. The ovarian and its 
parallel vessel, which empty themselves into the renal vein on 
either side, were well developed, and each couple of vessels were 
connected by more than one anastomosis. J am not quite certain 
whether they were also connected with the posterior ovarian 
veins flowing into the posterior part of the postcaval. In any 
case the connection must be by means of minor twigs; for the 
main vessels could be seen easily to pass dorsally to the posterior 
ovarian trunk on each side on their way from the generative 
organs. One of the two anterior ovarian veins becomes ¢ connected 
by a transverse branch with the common iliac vein just before 
the union of the latter with its fellow to form the postcaval. 
The position of this vein, which runs transversely into the 
iliac, is very suggestive of the posterior lumbar parietal vein of 
other Mammals. It is, however, certain that in the present 
species the vein does not bring back blood from the parietes; it 
is merely a junction as already described. I could not find a 
vein corresponding to this on the right side. The left suprarenal 
vein had an antero-posterior course opening into the left renal. 
The two posterior ovarian veins were asymmetrical, the left 
joining the postcaval considerably higher up than the right. The 
left vein had furthermore two branches, also connecting it with 
the posteava lower down. The lowermost of these was a stout 
branch which gave off a backwardly running twig to the parietes ; 
it may be that this vessel is really the homologue of the lumbar 
parietal above referred to. I noticed nothing of the kind in 
